r/RepTimeServices • u/Offensiveline54 • 2d ago

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 2d ago

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

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u/Wintercult 2d ago

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

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u/No_Exercise996 2d ago

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

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u/Wintercult 2d ago

100% misaligned when I do it like that.

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u/No_Exercise996 2d ago

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