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Depends, and maybe a piccie would assist those trying to answer.
On some focusers, the knob underneath "disconnects" the focus knob from any involvement in moving the draw-tube in or out. This could be what is happening with yours, and when it is pointed straight up, the weight is pulling the focuser out. There is sometimes a knob on the top to adjust the tension of the draw=tube, do you have one of these?
Gary
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