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Just a follow up for those who may be following this thread. The solution to my slipping vernier adjustment was cured by tightening the nut on the
focuser shaft behind the main/vernier knobs. The tighter the nut the more positive action of the vernier but there is a trade off in increased general
stiffness in focuser movement by the main knob. You don't get something
for nothing!
Cheers Peter
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