RE: Mechanical BH failure
Depending on what mechanical you are shooting and how fast your bow is there are different positions where to place the rubber o ring. My friend shoots the wasp jak hammer and hasnt had a problem and I shoot eastman firstcut's and have never had a problem. I have also heard of people using two retention o rings. There is a very slim chance that on impact the dull spur of the blade will not catch on the hide or flesh to open the blades.