On Sun, 22 Nov 2015, gareth wrote:

On the basis that someone must manufacture the things in the first place,
has anyone much experience of disassembling volume controls and
the like to deal with scratchiness, for AIUI, injecting WD40 although
seeming
to provide an interim solution (sic) only stores up problems for the future.



WD40 is not a good choice, though some may have used it in emergencies.

IT depends on the potentiometer. A lot of the old ones could be pried
open, little tabs at the front. But there are also fancier ones that are
sealed up in plastic casing, I'm not sure if those can be opened, though
hopefully some of the dirt problem is fixed. Maybe drilling a tiny hole
(like for component leads on a circuit board) and then dripping some
cleaner in would work?

Michael