I purchased my Ruger American 9mm today and wanted to try out the different back straps to see what would suit me. At first, I tried to turn the screw the 1/4 turn counterclockwise as instructed. Well, I was a little concerned with the looseness of the torx wrench they gave and was afraid of stripping out the torx hole. I got the wrench to tighten up but could not get it to turn the 1/4 turn to take off the back strap. Well here I discovered Ruger left the screw unlocked and I popped off the strap and installed the one I wanted.When I tried to lock the strap with a 1/4 turn clockwise once again it wouldn't move. I told off the strap and can turn the screw up and down with ease, put the strap on and I can't move the screw. I don't want to force it and strip the torx so I left it go and assume the strap isn't locked down. Anyone else have this issue or can point me on what todo?