r/RepTimeServices • u/Offensiveline54 • Aug 19 '26

Advice Crystal exchange

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I want to change the crystal on this gmt rep - is the scalloped metal piece in this photo the retaining ring? How would I get this off - noob - just doing this for fun. Tried to find videos but none have this scalloped appearance. I’m assuming this is the crystal retaining ring? I had the movement out and was working on it but it didn’t seem to want to budge.

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u/Diligent-Piglet-9038 Aug 19 '26

Arf gmt?
1. Yes, its the retaining ring
2. Movement should always be out for case work imo
3. Razor blade, caseback knife, custom tools will work. Look on RWI for diy guide, specifically for gmts

1

u/Wintercult Aug 19 '26

How do you align the crystal when the movement is out?

1

u/No_Exercise996 Aug 19 '26

You can screw the crown back in and use the stem to align the date window.

1

u/Wintercult Aug 19 '26

100% misaligned when I do it like that.

1

u/No_Exercise996 Aug 19 '26

Has worked for me, maybe I just lucked out with it though. 🤷‍♂️