It can varying result .Some models from JF are thicker some are less. Depending on the individual model it can vary. Gen like thickness can be achieve if remove deco plate or exchange rotor .With keeping rotor and deco plate need to check individually as not all are the same from what have handled recently.
OK. Then the priority is to rather change the movement than reduce the case by 0.5 mm... The problem seems to source the DD module 293. How can we get a new one ?