it might not seem like it, but it's really straightforward.
just a switch that's connected to the pot with a metal brace.
think i might've unscrewed the pot first so there's a bit more room, it's been a while.
you cut open the clear shrink tubing, unsolder the wires (remembering where which one goes!), take the switch out of the brace, put a new one in, making sure that the little metal pin from the pot is hooked into the top.
put a new heat shrink over the wires, solder onto the new switch, shrink the tube, screw pot back in.
not much more to it - tedious but very easy, like most things on 4ks.