Hi everyone
I have managed to sort this out, thanks to all your help. Saturnine in particular was right on the money - I needed to adjust the small screw that was below the locking screw. It is a little recessed so I didn't initially realise there was a screw there. So I ended up wasting a bit of time trying to loosen the wrong screws.
I've been able to adjust this now, and the focuser moves much easier. I've made sure it isn't too loose, so the whole thing doesn't drop down when I put in an eyepiece.
Thanks again
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