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Credit goes to Reece. He mentioned an adjustment screw. There's no screw, so I tried an alternate way to adjust it. Maybe the dimensions hadn't changed, but the end bearing was damaged from 75 years of grit and grime.
I can't envision needing to narrow the frame, but I'd probably take off the rotor and whang the frame with a hammer.
Incidentally, after I put it back together, two or three rotor plates were touching stator plates. I had to go back and lighten the separating pressure by shortening (shaving the end) of one of the plastic posts. And I still had to manipulate the plates to get them adequately separated.
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