Did the retaining ring come with the case or the bezel? If it came with the bezel it may not fit the crystal properly. If it came with the case, it may not fit the bezel properly. If your WSO bezel set came with a 5 digit (sapphire crystal) insert, it is likely a 5 digit (sapphire crystal) bezel also.
Some good info in this link.
http://www.gmtmasterhistory.com/gmt-...ref_16750.html
This is what I'm working with below all from wso. All stated it was for 1675, 16753 etc.. so if the insert is for 5 digit maybe they sent me the wrong one. It pressure fits really nicely into the bezel.
All from wso. I had some new wso 116 xtals that I bought probably 6 years ago that I tried fitting. So the retainer would not go over them without sanding. Had to sand a decent amount and it made them more brittle. I broke all of them, the last one I actually got it all together and everything fit and felt perfect. But I broke that one too when taking it off. I always intended to use a Clark xtal which is on the way, im hoping it will fit.
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