I took delivery of a 90mm refractor today (SVbony 90mm f5). It has a 2 speed crayford focuser and this is my first time using a crayford. When I picked the scope out of the case, just tipping it a little made the drawtube slide right out of the focuser (to the internal stop). No amount of tightening the screws on the bottom helps, except for the thumbscrew which really just locks it.
I am guessing this isn't how it should work? I have heard of these focusers sometimes slipping under heavy loads, but I can't attach a diagonal and eyepiece to it unless that big thumbscrew is almost totally locked. I don't dare point the scope up. Thanks!