Ok, so the Trigger Housing pin is a straight M3x23mm, no problem replacing it with a stainless pin from the hardware store. The Trigger pin has two cuts in it to lock it to the slide stop so it'll not "walk" during firing, go that, easy enough to cut it using a drill to turn the pin and the Dremel with a cut off wheel to make the cuts. Question is about the Locking Block Pin. Big on both ends but turned down along the middle part of the pin. Why is it turned down, could you just run a straight pin or is it turned down so it'll catch or something like the Slide Stop Spring so it'll not "walk" or what? Thanks.