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Hi Chris
First, I would wait for someone with experience of this particular focusser. Hopefully not long.
Depending on that, I would suggest loosening the 4 Phillips head screws just a quarter or half turn at a time, with the larger knob loose. If the whole starts working for you, then tightening the larger knob should then increase the tension nicely. If, of course, I am right about how it works together.
Good luck
Philip
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