The original grips are being reinstalled (aftermarket grips are in place) on a Beretta 92. The lock washers are missing. Are these just normal split lock washers or something unique for this? I'm having trouble findings a source for these. The screws seem to hold the grips on fine without them, but the screws then protrude far enough into the frame that the magazine gets hung up on them. Can I find these at a hardware store?