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Bezel Insert question


adrenalin

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Greetings all,

You guys know how this all goes...

I am getting ready to swap a dead noobmariner movement with a DG4813 and I notice that the bezel insert on my noob GMTII was looking pretty shoddy, so I thought while I am there....

So here is the question. On the Otto Frei website, it list their bezel inserts to have measurements of 37.50mm by 4.0mm in width. Now upon measuring the bezel insert on the watch itself measures 37.50mm by 3.5mm in width. Does the Otto Frei guys round their measurments up? or do I need to shave 0.5mm from the internal diameter? If so how do you do that and keep it in round? I know that you guys have done this a bazillion times, and I would apreciate your guidance. I know that there are some simple mods required to make an accurate fit with regards to bezel height and thickness, but the whole diameter thing and making sure that it doesnt turn into an elipse doesnt really thrill me too much...

Thanks for any input!

-K

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