David, I hope you can "find' a way to do that. tighten the mirror/glass plate. For this very reason, I bought N.O.S. remote mirrors,(driver side only), and had them installed instead. They were very expensive.
There were no re-pops at that time. I spoke with the platers who do them,(Pauls Chrome plating out of Mars Pennsylvania), and they said it woudnt be the same after plating, the mechanism would be 'loose'. Wonder if someone has figured out a way to do it?