Another very irritating "feature" of pots is that over time the wiper can
deform the resistance element. When you go to adjust a pot (like when making a
calibration adjustment on an old piece of equipment) it can be very difficult
to get (and keep) the setting where you want it to be if the new setting is
close to where the old, well aged, setting was. The wiper will wind up on the
deformed "slope" of the resistance element which is no longer a stable place.
Also once the wiper is moved off the deformed point the wiper may relax over
time and the adjustment will drift. You may have to replace the pot to be able
to set and keep it where it needs to be.
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