Tom,

They don't make them that way these days. Twenty years ago they had metal cases and tabs that could be bent back. In many instances the new pots are part of the circuit board and the carbon wiping area is actually embedded into the PC board itself and sealed within a bubble. I looked at a small, PC board a couple weeks ago that was totally encased in plastic. It had three pots, but the only option for repairs was to replace the entire unit. Keep in mind that I'm old enough to remember tube testers in drug stores.

Cheers,

Gary