I think GC Electronics made them for their contact cleaner. Long cylinder that threaded onto the mounting nut, maybe 5 inches long and necked down to a small diameter that fit the aerosol nozzle of the contact cleaner.
Check electronics magazines of the 1950s.
I see the StewMac cap advertised. Only good for short shaft pots.
Frank DuVal
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On 4/16/2019 6:26 PM, John Kolb wrote:
I remember seeing in the distant past, a catalog picture of a pot/contact cleaner which threaded onto the pot threaded bushing. I guess you would then put in the cleaner/lube, and push a plunger to force the cleaner into the pot.
John
