Update on my slippage and focuser.
I have spent a couple of hours today going through all of this in the daylight.
I am happy that the motor unit is installed correctly and that the slippage left is not too much of an issue.
using the adjustment screw identified underneath the focuser i have got it to almost be 0 slippage.
I now understand the design of the crayford focuser a bit more too having done a bit of reading.
Thanks all for your help with this..Jack
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