Use them all the time. Like ken rose said they add about 10 grains. Been using the same ones on my four hunting arrows for two years now. One arrow has passed thru its third deer and looks like new. I use feathers and have no problem gluing them. I've also put vanes on for some guys with no problem. I use Goat Tuff for my glue. Good luck

As long as kids are having fun shooting, I don't care if I shoot bad