I have a new pressure test machine to test my watches water-proof(ness) and have seen several videos on testing watches and I am confident that I can perform a test on the types of watches with a screw down crown. However I have other watches (non-diver) which are 'water resistant' but they have a regular push down crown which I wold like to test. Does anyone have any tips on how I keep the stem/crown seated in place during the pressure testing process, without a movement in the watch case to hold them in position the stem/crown could simply fall out. during the set up or shoot out during the de-pressurisation phase of the test. I was thinking of using some tape just to physically hold the stem/crown in position mimicking the function of the key-less works, but wanted to know if anyone had any 'best practices' or other ideas?