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Quick update:
Many thanks to all the contributors. I've managed to get the focuser behaving again.
It's an odd sort of arrangement. The screw closest to the tube doesn't appear to do anything at all (though I'm sure it does) so it's just left loose. The one closer to the eyepiece...I just gradually adjust it until it 'grabs', test the focuser, adjust, etc. Took all of two minutes.
Spent the afternoon peering at the moon. The detail is quite extraordinary- in fact we found with the 9mm eyepiece that the image is 'too large' so we had to use the 15mm instead.
Now, to build that observatory...
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