Had a few minutes today to go through my P9S spare parts inventory. For those not familiar, there are many tiny parts, some parts differed by caliber, and other parts evolved over time and became incompatible with previous versions. I have a pair of "set screws" part #201446. The only "set screw" identified on my parts diagram look nothing like my spares, and is used to secure the bolt catch in the bolt carrier. Does anyone know where the set screws get installed on a P9S? James?