I just bought mine a few weeks ago and the pot has become hard to turn near the top end. Imagine that it's oiled smoothly, turns without any issues, then half way to the top it feels rough, like the knob is grinding against bare metal at some increments.
Is there an easy fix for this? Will it get worse? I've treated it like a baby, btw.
Can you try pulling the volume knob a little bit away from the casing? Just around 1mm, The knob may be scuffing the metal casing when reaching a certain volume. it's just a metal knob that slides over the pot.