The internal trim rings are heavily corroded.
Will start by trying a hand wire brush.
Old tool bought at a swap meet.
"LA Brush Mfg. Corp"
450 SS
(for stainless steel?)
Looking up this company, it was incorporated in 1924 (in Vernon, CA) and was dissolved last year.
Pretty heavy corrosion.
The part was painted black originally but a lot of the paint is gone.
The second trim ring is even worse.
After using the hand wire brush.
Better but still pretty uneven due to the corrosion.
Next step might be to use a powered wire wheel (on a bench grinder) then a powered sander to smooth out the surface?
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