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Thanks all for your assistance. I pulled the RC scope's focuser apart and found the problem.
The adjustment screw that puts pressure of a pad to move the rotating adjustment shaft against the inner focuser rail is on a very flimsy plastic assembly. This had cracked thus not allowing the screw to exert the required pressure.
See attached photo for my fix. The small 12 gauge plate provides a firm base. The focuser now works nice and smoothly.
How this plastic fitting outlasted the scope's guarantee period I don't know. It is moulded in a most flimsy fashion. I am happy with the performance of my GSO RC scope otherwise. Paul, you are right about the focuser. Plastic is good but how often do we see something ruined
by its failure?
Cheers Peter
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