AC Air Handler Motor Went South and DIdn't Come Back - Where of Where To Find One

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One of my rental's AC Air Handler Fan Motor finally went kaput after 33 years of faithful spinning. It must have gotten dizzy or something. Well, today was 117 degrees so I decided it might make sense to fix the thing. I was actually dripping sweat removing the motor.

Anybody have a source for GE 1/2 hp 3.3 amp 1 phase motor armatures? This one is baked. I couldn't find a replacement on Ebay, Amazon or any garage sales.

Or, in the alternative, some guy on Youtube used 400 grit sandpaper to clean his all nice and shiny, but I'm wondering if the abrasion would short the coil?

Any ideas?

What it looks like, Black and Grimy

What it's supposed to look like, Bright & Shiny