I don't really understand what you mean here. I can press my shoulder button as hard as I want. All I've done is make it so that the rod inside it is longer, everything else is the same. The little "spacer" I put it can't fall out, it's all contained within the black tube that holds the shoulder button in place, and I have no idea how the rubber plate could fall out.Edit: From 9bit’s text, it seems that with his mod, it’s no longer safe to press as strongly as you want to, since the rubber plate will be the only part providing resistance against your grey trigger piece. So, unless I’m misunderstanding, pressing strongly might make your rubber plate fall out, so you can’t hard press any more (until you open the controller and put it back in). This does not happen with my mod (but again, maybe it isn’t with his either, not sure).
I can take some more pictures if that would help.