Thanks, Paul!
Actually, this is one of the features I wanted to implement this time.
I think I found a way to do this in a open faced plaster mould!
I think he could tell you.... but then he must shoot you
j/k... (of course) In fact, Paul's knowledge is the result of dedicated reasearch for several years, analyzing every piece of information over and over again.
BTW: The indented "knuckels" can be seen on the "promo hero trooper"