That was an idea I toyed with, also. (Which I suppose has the added bonus of not getting flakes of plastic falling inside your P1 and rattling around.) Where did you get your crown? Did you go for the blue or red variant?What I did was remove as much of the peg on the bottom of the watch crown and then only had to make a very small depression on the P1 to fit what was left with a small knife. By doing it this way you don't have to drill all the way through the P1 and risk messing anything up.