So, I have an expensive update.
Firstly, I learned that disassembling the potentiometer would be a very bad idea. They're apparently calibrated at the factory, and even if I could fix the issue it would be a pyrrhic victory. So, it's a good thing I didn't!
Packing some dielectric grease into the assembly from the outside has bandaged the problem, albeit at the cost of a less snappy throttle. For the time being, it's a fair compromise.
What caused the issue was my Kaoko Throttle Stabiliser cruise control thing. Now, I'm not saying they're a bad system, so long as they're used properly! However, it's easy to use them improperly, and that is what seems to have caused the issues. They work by putting a plastic bushing/plate on the end of the grip, which interfaces with a replacement bar end weight which can be screwed left and right. You can screw the bar end weight tighter, and it'll put pressure on the bushing. This adds resistance for those who prefer a stiffer throttle, or stops the throttle turning for cruise control.
You're only supposed to use a bit more than the minimum effective pressure; however, it's very easy to accidentally overtighten it. If it's overtightened, and you try to make small adjustments to your speed, say on a hill, the pressure on the APS can cause premature wear on the inside of the potentiometer. The end result in the video speaks for itself. Looks like something which happened over a number of years, and a number of owners, but I'm just as guilty as the last!
Stabiliser removed, new APS ordered. Be warned, the Kaoko is a good system but less torque is more!
