Seems a lot of people are having problems with the regulator loosening on the dove tail of their VS markers because the locking screw just isn't locking! We at SPPS have resolved that concern by adding a partial coating of our Fast-Loc emulsion to the set screw. There's no waiting for any Loc-tite to dry. Simply screw it in place, torque it down and the regulator isn't going any place. As long as you do not completely remove the screw, Fast-Loc will continue working even if you temporarily loosen the screw slightly for sporadic maintenance purposes. These set screws come in packs of 2.

This is a replacement for Kingman part #SCR010 in your manual with the added hold down security of SPPS Fast-Loc emulsion.