A novice question, I'm looking for a replacement crown for my Zodiac Guardsman Automatic. I've measured the stem at 0.70mm. Done some research and according to the Esslinger website that's a TAP12. What's confusing me is that on some other websites and Ebay they say TAP12 is 1.2mm and TAP7 is 0.70mm. Its a threaded stem (couple of pics below). It's conused me and I want to make sure I order the right thing. Sorry for starter question just getting into this hobby which is both fascinating and absorbing (and addictive). The Stem comes to flush with the top of the case tube and I believe I'm looking for a watherproof crown. Can anyone help and advise? Thanks all.