Hey Stefan.
No, these numbers are not for PS12, there was 25 to open and 75 to close. On pic I just showed how I work with protractor and pointer.
About get BDC-I do the same-jst the difference is, when I work on cranck-I use loos p/l set with new conrod (I can afford it

). So I am removing play from every (conrod on cranck pin, conrod/wrist pin/[iston) the rest the same as you.
Hey Dieter, I do use formulas, but when I work on designs of engines, when it comes to real metal I use protractor.
Edward