I bought a PSE Mach 12 about 9 months ago and it is my first bow. It came with a cheap sight on it that always rattled loose no matter how tight I tighted it to the bow. Recently I bought an Axion sight and got it sighted in perfectly the other day, but after about 50 shots I noticed the sight was started to become loose. Is this a common problem with the Mach 12 bows? Or does anyone know anything I can do to try to prevent this from happening? I don't have enough money to buy a different bow right now and really want to be able to shoot 3D this summer and hunt in the fall without having to tighten the sight all the time.