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I'd guess that the most probable suspect is the nylon, but another thought, might be the bearing has swollen.
Pot metal is well known to swell with age and I'd assume that these bearings probably were cast and not machined.
On some pot metal assembles from the 1920's, I've run into swelling pot metal that has pinched the steel shafts after long storage. I found it easier to ream the bearing than to polish the shaft and either seems to work equally well.
Last edited by earlyfilm; 08-23-2012 at 05:26 AM.
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