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In Schmidt cassegrains the focuser positions the main mirror on the greased primary baffle and the tube needs to be horizontal or pointing up if the focus knob is removed. There is also a C ring that stops the mirror from sliding off the baffle by mistake but perhaps the Mak doesn't have the C ring/safety ring at the end of its baffle?
In any case Bintel will be able to fix it for a modest fee I imagine.
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