The raw ring is for the 126710, it’s a service part so maybe it’s different.Yours is gen 116710LN bezel. I have done the bezel mod on the same one. There’s no lip on it, as you said the surface is not flat. There’s a lip only on the BLRO; not on the BLNR, LN, CHNR, seven up, etc
This is what they would use to replace a BLRO insert and the ring unit, or atleast this is what is in the part technical specifications chart for Rolex service.
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