"Dan_Musicant" wrote in message
...

It seems very much like when I spin it not very quickly it works fine.
It's when I try for a quick change in volume that it tends to slip. I
suppose it will only get worse over time. I presume there's no chance of
rejuvenating the current encoder, eh?

If it's bad contacts, moving it a lot may fix that. Otherwise you need to
blow tuner cleaner spray into it (not WD40). But no guarantees.