I don't know WTF is going on here. I have the GL rail key in it, I loosened the screw as much as I could have, and no matter which way I try to install it, I can never get a secure fit. The most secure I can get it, it will fall off if I shake the gun really hard or pull it off. It's almost as if the "loose" side is not grabbing anything, no matter what I try. The "fixed" side is grabbing just fine. Any suggestions? I'm about to smash this thing or send it back to Streamlight.