This is quite common. The nut has rusted to the stud and the stud is either swaged or resistance welded to the backing plate. When the nut rusts to the stud that connection fails and the stud/nut assembly just spins. I usually just drill it out from the front then reinstall it with a suitible size machine screw. Don't forget the anti-seize.
Jason T.
Yes, you'll see that there are two rubber rings: the outer one holds on the chrome ring and the inner one holds on the glass itself. Use some lubricant and a thin screwdriver or knife to slip out the pieces.
I had to replace one of mine, too. It's slow going when it's all corroded in place but it will come off.
Jeff
Jeff Aronson
Vinalhaven, ME 04863
'66 Series II-A SW 88"
'66 Series II-A HT 88"
'80 Triumph TR-7 Spider
'80 Triumph Spitfire
'66 Corvair Monza Coupe http://www.landroverwriter.com
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