[Collins] Collins 51S Volume Control

[DW Holtman]

Hello,

Does anyone have any idea where I might locate a 500K dual pot with concentric shafts. The inside shaft is rotated with a screwdriver for the line output adjustment. I believe they are R-75 and R-56.

I have already check all of the online sources I can find. Maybe someone has a parts 51S-1and would sell this item?

Thank you in advance. 

Best,
DW Holtman
WB7SSN