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... The U joint coupler must be a tight connection, any slop would mean poor response when moving between Forward and Reverse, you want zero backlash. The 1603EF has no backlash in it's gear train and actually a well made unit.
It's surprisingly easy to hit best focus and make small precise corrections with the R and F buttons.

Robert

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That's the only thing I'm considering tweaking for using the 1603EF motor on my SkyWatcher - the spokes on my focus knob give a couple of millimetre's slack meaning fine control F/R suffers from a delay when switching direction. That's what you meant by "slop" I assume Robert? When it stops raining, I'll try it as is, but a tighter fit shouldn't be too hard to improvise...

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Yes no slop. Because you are shifting forward and backward hunting for a sharp focus. You will overshoot and back up sometimes and you will find slop is intolerable. Once you get the hang of it you can zoom on in and nail it first try, and that's a great feeling, especially at extreme high power.
The motor's tines, where they to plug into the focuser knob should be coupled tightly. Possibly silicon tubing on the "U" tines where they plug into the knob recesses, so everything is tight.

Robert

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