I took mine apart, desoldered the potentiometer, dissasembled the potentiometer. In there is a yoke shaped contact thingy that I bent to give better contact. Put it all back together and it is still working fine after several months. However the first time I put it back together I screwed it up and broke one side of the yoke thingy off and I had to jumper a couple of solder traces that I broke. Kind of alot of work.
Maybe find a good unit thats missing the code and just scavenge the potentiometer.
You have to desolder those 4 wires off the little circuit board. you have to dissassemble rhe entire potentiometer to get to the yoke contactor thingy. To do that you have to desolder several other connections to free up the individual components of the pot . Then jyou have to bend a couple of tabs on the back side to get the little plate off in order to take it apart.
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