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I also have an old 500mm mirror lens that I have also been playing with as a guider. It has fungus inside it but this hardly matters as a guider.
It works quite well but yes focus is crittical and if you bump it the lens turns very easily losing the focus. The main problem I have with it is that it foggs up really quickly as it has no dew shield. I suppose I could make one but haven't yet. This is the time I bump it-using a hairdryer to defog it.
The mount is a T thread so any eyepiece T adaptor will fit on it. I assume yours is the same as the nikon adaptor fits.
It is a very cheap and functional guide scope.
Good luck with yours.
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