Do you have the Old (Original Control) AF/RF Control with Switch ??
I can be restored OR used as pattern to reproduce with OEM Parts.
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The Drake R-4C receiver used a Concentric AF/RF Control of diameters of?
3/16¡± and 1/4¡± for the Knobs. ?The SPR-4 likely used similar or identical part w/o switch.
The 3/16¡± shaft size is Custom a Size for 21st Century Potentiometers.
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Common Concentric Controls: SAE 1/8¡± and 1/4¡± or Metric 6mm and 8mm
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Mark Oppat
Old Radio Parts
253 Blanche Street
Plymouth, MI ?48170
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Mark is well known to Antique Radio Restorers (1930s-1970s) for not
only Old Console Radio, Automotive Radios, and post-WW2 receivers ¡ª
But also the early Electric Guitar restorers.
Mark has a Large Inventory of Parts collected through the years.
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greg, w9gb
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Greg W9GB