It seems that alot of folks use cat whiskers with good results. When I first tried them, I put them about where I would on a verticle bow and they flew off(violent shake on shot) with only a few shots. Now I have them out toward the tips of the prod. or bow (I have a recurve crossbow) on theloop serving.The silencers haveheld up to about 500 shots so far and have quieted down my crossbow quite a bit. Probably lost some speed but I'd take quiet over a few fps anyday. Hope this helps. Grndhntr