From: sack
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Date: 16-Aug-18 |
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Ben Pearson 56" in clean condition but tiny twist in lower limb.Seems Ben built them stout.Hand twist with a good hot water bath doesn't want to budge and looking close at string nocks seems one side is slightly shallower with very little valley. String tracks slightly to that side.Is that the nock side to cut a little deeper and deepen the string valley?? Just double checking..not my bow.Built the string and caught it when testing stuff. Thanks.Sack
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From: 69 super kodiak
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Date: 16-Aug-18 |
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Did you hold it for a while after 1-2 min under hot water, then lock it in with cold? This worked for me after a few try's Good luck with it.
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From: Snow Crow
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Date: 16-Aug-18 |
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FWIW, a Grayling K Mag I bought took 3+ weeks of daily sessions of rub, counter-twist, inspect, and repeat to straighten a near 45 degree twist in the upper limb.
Finally got it straight and was rewarded with a faithful daily shooter of 2-3 years.
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From: longbowguy
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Date: 17-Aug-18 |
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Well, it is a fact that the glues used in prior years would creep a bit when warm. That is how they got twisted, maybe propped in a corner on the hot side of the house. So, if you heat them thoroughly all the way through and apply counter twist, small twists can usually be corrected.
You do not want to overheat as the glue may get too soft and you could lose the basic shape of the bow. It might cease to recurve. Water heater can often be set to around 140 degrees. If yours is set lower, you could maybe twist the know and get it higher for the project. I usually put a bow out in the California sun on a day that goes to a 105 which is not uncommon in the Sacramento Valley.
Twisting the bow on the offending side with your hands may get it done if you are strong enough and it is warm enough. But I now have a bow that has come only part way on a couple of hot days and twisted at the limit of my strength, which is considerable. Hold it for as long as you can and repeat multiple times. Hot water in the shower did not help.
Soe folks have set the bow up in a viic and hung a weight on the limb tip overnight but I am not set up for that.
Also there was an old Ben Pearson bow with a bad twist that I could not correct, It got it straight several times but after a session of shooting it was twisted again. I expect that it was so twisted for so long that the wood fibers were damaged and could not be corrected.
As for my current bow, I may try borrowing a hair dryer to heat it up and asking my 370 pound neighbor to twist and hold it. The problem is that he is known for being able to break almost anything. He once broke a 60 foot shrimp boat, and several jaws. He never starts fights but he has ended a few. - lbg
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From: larryhatfield
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Date: 17-Aug-18 |
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Actually, it's the bows glued with epoxy's that have glue creep. Urac would not creep at all unless you got the entire limb very hot. We had to use an electric cone heater to soften Urac. Epoxy, you can just twist cold. Could be the string groove or could be the bow was tipped out a little crooked. If the nocks are not cut level with each other it can cause problems also.
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From: Viper
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Date: 17-Aug-18 |
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sack -
I've see that with some Pearsons as well and I'd go with Larry's explanation. If that's the problem it may not be fixable. On the other hand, it probably won't get any worse either, and you might want to just leave it alone.
IF it's the string nocks being uneven causing the problem, that can and should be fixed and it depend on how good you are with a rat tail file. Or you can let a bowyer do it. The bad news there is that after you fix the nocks, it may not straighten the limb.
Unfortunately only one way to find out.
Viper out.
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From: Sam Dunham
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Date: 17-Aug-18 |
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Just keep twisting and shooting, some will correct, if not, I use a hair dryer or heat gun at a very good distance depending on the heat output. Of course. unstring it before applying heat.
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From: Jon Stewart
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Date: 17-Aug-18 |
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A friend gave me a real nice old Bear Grizzly to fix up and pass on to a veteran. I cannot get the Twist it of that bottom limb.I wI'll try using the hot water method a bit longer.
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From: camodave
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Date: 17-Aug-18 |
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I have spent 2 years to get all of the twist out of a bow. I often think of how long it took that bow to get the twist.
DDave
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From: George D. Stout
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Date: 17-Aug-18 |
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Most of that twist in the old bows 60's era and earlier happened because folks strung them through the legs. It was a different time and we didn't get stringers with a bow, and half the time no local shops carried bow stringers. You just strung the bow the way you were shown. Some are more contrary than others, but a hot water bath usually works and cold water when the limb sets properly.
I've only had one bow in my lifetime that I couldn't get corrected, and it went off to a guy who was willing to spend more time on that critter. Most actually are pretty easy to fix, but every now and then you get a difficult project.
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From: lost run
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Date: 17-Aug-18 |
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A guy went to sell me a Ben Pearson Spoiler 52". The top limb was twisted so bad the string looked like it would fly off. When he seen how bad it was he told me I could have it free. I put it under a bed in a room with no ac for about 7 years, I got it out and strung it up and it was straight. It has stayed nice and straight for 20 years now. You cant get in a hurry doing it this way.
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From: George D. Stout
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Date: 17-Aug-18 |
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I use heat (hot water) Shawn. The only memory it destroys is the bad memory of a twisted limb. When set and allowed to cool, it will regain it's memory of being aligned. It's worked that way for me since the 1970's.
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From: sack
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Date: 17-Aug-18 |
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Thanks for the replys so far.Still waiting to hear from the owner but will hold off on the invasive angles.I might try good ole Texas heat.It's 96 today and black fiberglass...soooo. Sack
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From: Keefers
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Date: 17-Aug-18 |
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If anyone needs a picture of how to twist a recurve twisted limb back just search "Blacktail bows" and search the web page they have a step by step method of doing it without heat or water! Just using your hands .Not sure how to post it or I would here so do a search and you should find it .
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From: Backcountry
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Date: 17-Aug-18 |
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This is a good time of year to fix twisted limbs:
Place unstrung bow on dashboard of your truck until it warms the bow moderately--careful, not too much! Then using a stringer, string the now and twist the crooked limb until string is properly aligned. Then place bow in a cool place, supporting the bow limbs equally across an arm chair or something. Leave overnight and re-check. Repeat if necessary.
Before doing this, make sure string grooves are filed in evenly, as Larry said. I like to use a chainsaw file. Re-seal exposed wood lams with a mix of superglue thinned with a few drops of acetone, applied with a cotton swab.
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From: larryhatfield
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Date: 17-Aug-18 |
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Basically, if your bow was made after 1961 it's most likely glued with epoxy. No heat is required to twist it crooked or straight. If it's earlier, it was likely glued with Urac and will need to be heated because there is zero glue creep with Urac. Any bow is only as straight as it was laid up in the press and tipped out. If it was glued up swept wing and not tipped out right it's a crooked bow and twisting will not make it straight. Many ways to twist bow limbs, even with a stringer, after the use of epoxy became mandatory after Gordon glass became the norm. Before that, there was never a twist problem. If you built the bow straight it stayed that way. I shoot a 69" Century 21 bow, (Howatt) that I built in 1961. It has such tiny tips you can barely see them and was built straight, glued with Urac and 3M glass and has never had a twist.
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From: Tajue17
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Date: 18-Aug-18 |
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I have a browning wasp I've been working that bottom limb back into shape maybe for 5 years now with a hair dryer and it keeps going right back to the twist,,,, I gave up on it I think some react and some don't.
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From: Will tell
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Date: 18-Aug-18 |
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When you break down material in a bow the wood is held together by links just like in a chain. When you add heat it breaks the links and that's why you can reshape it. When you add cold water that reunites the links in the new position. It's the same with taking a self bow and straightening it.
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From: MStyles
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Date: 18-Aug-18 |
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Some bows are harder to untwist than others, I’ve seen that. But I believe they all can be fixed. Patience and technique is all it takes. Of course I have little of either...but I am relentless ...^<>^
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