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Coatings
Hi BruceL,
You can try Spectrum Coatings in FL or Clausing Optical Coatings in IL to resurface your spherical mirror. I'm guessing the price is in the $250 to $350 range by now. A standard first surface flat mirror, cut to size, can be used to replace your lid reflector. These can be salvaged from modern rear projection sets.
Good luck,
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