[Collins] Source for 75S-1 S-meter adjustment pot?

[Don Faulkner]

Hello to One and All!
   I bought my S-1 line (new) in 1962 and have been using it ever since.  From the day it came out of the box the "S" meter zero would drift enough to be annoying and require raising the lid from time to time to adjust the zeroing pot.  Over a period of years either the wiper or the resistive element (or both) has become badly worn to the point where the wiper to element contact opens up a few days following "exercising" the pot adjustment.  Contact cleaner/lube helps only for a short time and requires nearly constant readjustment as it evaporates.
   Does anyone know of a source for a 250-ohm replacement pot with the appropriate physical size?  A web search found a note where someone else asked this question some time back (I think in 2005), but I found no replies.
   Thanks for any help.   ...Don (K5BTK)
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