This is what I have so far. It is a tight fit of the tube in the base. The thumbscrew is perhaps not strictly needed, but it makes less likely to fall out. I have ordered a 1 25" helical focuser that goes into the tube. The tube you see provides coarse adjustment. The helical focuser provides very fine focus. I can also use this in the 5" refractor and the 8" reflector, both of which have only coarse focusers. Big Bertha has a dual speed focuser, very nice for the perfect focus.
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