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Update
Lewis came by today and inspected the focuser.
His opinion was that the black line could indicate that a fault in the focuser casting had been noticed during assembly and the casting was then further machined in an attempt to rectify the fault.
We then loaded up the focuser with the reducer and the STF8300.
Using the manual control, the focuser moved outwards smoothly.
When moving inwards, the focuser would bind, severely, if further out.
I am sending the focuser to Claude for appraisal and rectification.
So far, from all the replies I have received, mine is the only focuser not performing as it should.
regards,
Phil
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