I ordered the pistol grip bracket for my PGL, and it works real nice and all, but the bracket tends to pivot around on the wingnut no matter how much I tighten it. Does anyone have a recommendation on some way I can prevent this?

Add a lock washer? Or a rubber grommet to add friction.

Thank you. I just go to Home Depot and say, "show me to your lock washers and rubber grommets?