Hello everyone. I have a question about the final/last production Hetzer ( like the one at Aberdeen Proving Ground,Md.). On the left hand side of the remote-controlled M.G., there are 2 notches on top of the gunshield.Doe's anyone know what these notches are used for? And if so,doe's anyone have any photographic evidence of it being used for it's purpose. Thank you everyone for replying to this question, I'am stumped!