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Gidday Darren. I had this happen to me on New Years Eve. Got the scope out for people to have a look-see and my crayford focuser wouldn't adjust. Grrr. Got it sorted though. It was the lock screws underneath. As someone else said, make sure they're not over tight. I leave the 'lock' slightly loose and the tension screw (the one in line with the focuser shaft) just nipped up firm but not tight.
You might want to consider stripping it down and giving it a once over. I did it as soon as I bought mine and it made a huge difference to the feel. I have a file that shows how. (I originally downloaded it from the web, so I won't take credit for it). PM me if you want a copy as it's too big to upload.
Stew.
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