Problem(s) Encountered:

Had issues with the instrument rotator again. When I used the handpaddle to rotate and stopped and started in short bursts (as I was approaching the target rotator angle), the value on the TCS would stop updating. After two such occasions, I rotated back to zero and the angle was way off (~10 in one case and ~30 in the other). Noticed this type of behavior at the end of my last run as well, but thought maybe it was a one-off. Seems to be more than that at this point.

Solution:

Adjusted the spring plate tension but problem persisted.  Lowered the north-most rotator plate enough to access the two mounting bolts for the rotator roller.  Slightly loosened them and hammered the mounting plate inwards slightly.  Tightened all bolts back up.  The theory here is to increase contact between the rotator and the roller for the rotator’s encoder.  Testing showed no sign of the previously persistent error.