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Not familiar with Pc7 but sounds like it will work fine. I still would prefer a quick set epoxy like 1or 5 min stuff. My favorite is Locktite Quickset 5 min. Last thing you want is for the washer to...

I'd vote for quick set epoxy over super glue for fixing the washer to the scale. Seems this stuff bonds to most anything. In all likelyhood this razor isn't going to be taken apart any time soon.