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Test result.
The clouds allowed me to do a quick test last night.
For this test I re-aligned my mount (not very well as you will see) but did not align in the controller so only the RA motor was running during tracking.
The chart is as you would expect. I seem to have had backlash issues in DEC as the corrections take a long time to become effective and then (mostly) cause overshoot, I assume this was due to a the balance of the scope in DEC not keeping the gears loaded. Not quite sure how to cure that however the excursions were not too bad and a 600s exposure at 1.2 arc" per pixel has reasonable looking stars....
...Next test...offset the mount and align in the controller....
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