Ok, in a previous post, I asked about adding cat whiskers on the cam side of the speed nocks. Threw a pair on the Onza this afternoon, and did some testing. By putting them between the speed nocks and the cam, I gained 2 fps. Had to make them pretty small so no rubber was able to cause problems at the cams, but it made a tremendous noise difference, and even gained me a bit of speed. I'll be trying them on the FC400 next. I actually tied them onto the heat shrink tubing ends that stick out past the speed nocks. Cut them down to the size of a 50 cent piece or so. Seems to work really well so far. Probably cut 60% of the string noise out. The one drawback I noticed was, there seems to be a bit of a "thump feel" to the limbs as the bow is fired. Not a big or bad thump, but just something I noticed. Figure it's just the extra weight of the silencers. Nothing I can't live with for the benefits I got though.