[morzh]

Well, I gave it a shot.
I opened it up, cleaned it (with alcohol - Varsol seems to be not readily available), used some DeoxIT Greenlabel (Fader Lube) on it.

Where it was the low volume sector, there was bad-bad-bad scratching and the volume would go up (I figured - bald spot), so after cleaning this remained unchanged. I can't have low volume on this thing. After opening, the element did show a large etched bald spot, so obviously through some weird pattern the wiper connects back to a higher resistance part of the scale, increasing the volume, and then, after some really bad scratchy zone, goes almost to zero.

Don't think much can be done.

So, anyone know off hand a replacement part that would mechanically be a good fit? It's a 20K potmeter (don't know linear or logarithmic), with SPST rotary switch.

I looked in Mouser, doesn't look like they have what would fit.