alternator fins rubbing

["Kronberg, Peter" <Peter.Kronberg@hp.com>]

Hey List,
Yeah. You thought you'd heard the last from me for awhile, huh? Well,
here's a question. It seems I've developed this whine at low RPM which I
have since identified as scraping of the alternator pulley fins on the
housing. Is this indicative of failing bearings, bushings, shaft, shaft
collar, pulley or...?
Anyone else seen (heard) and successfully addressed this?

Thanx in advance,

Pete
'76 CF51563U Running well, but with a new irritating noise