I doubt you'll find a mechanical that will not open when shooting through he mesh window. Instead, you could sontinue to shoot your fixed blades, but tune your bow to shoot them. For me, sometimes it's a matter of moving the sight a 1/16 of an inch. Is your bow paper tuned? If not, that should probably be done first. I think the thing that is most critical with shooting is follow through. Make sure you are following through. Also, make sure you are aiming at the smallest detail on the target, instead of the general area. Most of all, DO NOT PEEK! Your arrow will hit the target whether you watch it or not. Watching it won't make it hit the "x".