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What I have noticed is that it is quite difficult to ensure that the focus motor is straight on the shaft (This might be better on the scopes with a larger diameter focus knob that does away with a plastic insert) and the focus knob itself does not run 100% true, so you can hear the motor speed change at the same points every revolution.
I don't recall the calibration routine running at any different speed to normal focus action, but they might have done firmware changes since mine was built as mine is a quite early one.
The loose part I was talking about is actually the lock nut on the end of the shaft through the focus motor body rather than the set screw that locks it to the focuser shaft itself.
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