I'll work something out. Maybe drill a small hole under the mount plate big enough to slide an Hex key in there.
The idea of feeling the binding over a whole revolution of the gear is that the gear is not perfectly cylindrical and also not perfectly orthogonal to the shaft axis so it slightly goes up and down and also in and out. The aim is to compromise between the hardest spot and the least backlash possible. When you get those two down to acceptable results your tracking will be a lot better.
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