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"Where can a guy find one of the backs with 30.5mm threads?" I measured an older cartel case and the threads are 30.45 mm. The gasket groove is cut in the case, not the case back like genuine though. My DW cases with 30.4mm threads are made like genuine but being 30.4mm they might be too loose for 30.5mm threads in a case. Misc BS: Waaay back I bought a DW case without a case back and used a River Exp II case back (30.9mm thread) on it but had to cut a gasket groove in the case because the case back was too thin. The submariner type case backs I got from Raffles Time were the same as the old cartel cases with 30.45 threads and gaskets in the case. H-arou case backs might work in a 30.9mm thread case. RickFlorida...let us know after you try it.

Let me add, be exceedingly careful doing so. The Yuki ring is a snug fit to prevent the movement from sliding around and it's easy to break it in half at the slot as you press it in place. Pricey little buggers.

Correct. The slot in the movement ring is for the stem. If you put it in the wrong way, the stem wont go in. The pics are correct.

I have the app and the card. I’ve only used it a few times but it seems good so far.