I found a GREAT way to hold targets onto fiber matt butts, wanted to share with folks here and help out. I combine two prior ideas, take the plastic discs off "plastic cap roofing nails" and drill larger hole into center, then push onto a LONG BAMBOO golf tee. So far seems unbeatable for cost, safety, efficiency.
Adder: Use a sharpie to get the top of a few tees head ALL black, and put RIGHT at the center of the gold circle on the target and tell folks to hit the pin. It sure seems to increase focus for me, and most books emphasize "aim small, hit small." This is easy way to make it happen.
How I got here: not important, but sort of interesting...
I used the roofing nails and their discs alone for a long time, but worried that I would drop one and a kid would step upon it, puncture their shoe and their foot. Just not safe. I always counted nails at the end of the day, one day came up short... and it took us 20 min to find.
So we started using golf tees so I could feel better about it if I lost one. I doubt they would go through a shoe as the point is pretty blunt. Unfortunately the paper would pull through the heads. Their wedge shape just tears through paper each round as you remove arrows.
So- I added discs from the roofing nails to get a larger surface area pushing on the paper. I can drill two at once with a drill and pliers, so pretty fast to make up a batch of target pins. But- the wood pins occasionally break. So I bought the "7x stronger" 3 1/4" bamboo tees at 200 for $10 on ebay.
I think I have it "nailed" now: For about $0.07 per unit these hold VERY well, are very durable. I bought a pack of 250 40cm and another 100/ 80CM targets from Alternative Services in UK with one of my orders and got target cost down to ~$0.22 and $0.50/target. As long as we don't break an arrow, we now spend quite a bit more on gas than on range equipment. I give targets away to newbies, let them use my pins, etc. Cheap goodwill and more fun for them- and at the end of a day beginners can see if they are shooting left, right, high, low from the hole pattern. Priceless.
I am now considering putting little micro wedge cuts on bamboo to see if they will grip the fiber matt bundles a bit better. They work ok now, but I am one of those fellows that keeps looking for ways to improve processes. Downside is it will absolutely weaken the shaft- it failed miserably on the wood tees, hoping with the bamboo it will do fine.
If someone does hit the pins, no damage has ever been done to an arrow. The wood and plastic give enough/break, etc.