Geoff - one more question. I had trouble using the focuser when experimenting this evening. The focusing knobs turn - but they aren't moving the drawtube properly and in some cases just let it fall back into place again. The booklet that came with this scope says "The black nylon thumb screw on top of the body of the focuser is to lock the drawtube in place once the telescope is properly focused. Before refocusing, remember to first loosen this thumb screw".
Huh?? There is no "black nylon thumbscrew" on my focuser at all.
Did you experience this same problem when you first assembled your BT252?
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