I just got some good advice from the pro shop. I have been using the leech since June and have sliced 8 of them in half. The guy at the pro shop said they wrap the leech in mole skin and put them more toward the axle then where I was installing mine. As for the noise, I noticed a big difference after I installed the leech, but I can compare them to anything else because they were the first silencers I put on this bow.