Im pretty sure thats the right way up, given that the empty space under the flange on the gasket will be filled with the metal of the bezel. On a gmt, with the extra step on the retaining ring (the 12 indented click spring seating indents) its possible its upside down compared to a sub. Ill let you know when the parting tool arrives and i can finish my first attempt. Its been a long day and my initial “they will be about £10” was way off! 4 hours of machining and £15 of material in and i still dont have a working one... there should be a good 5-10 from this piece of material but without a parting tool i wont know if they work until Wednesday.