Today I collimated the scope, first with naked eye/daylight and then a fine-tune with a star. It's made a real difference, and I'm very happy. It was not difficult at all, I just took my time and adjusted one screw at a time so I could see what was happening.
I noticed that the locking nuts weren't very tight at all when I started, and that care needs to be taken when tightening them after collimation. I did this at 338x magnification, and got them nice and snug. The image shift has reduced considerably, and the focus is much more positive.
Thanks everyone for your input. There's been a significant improvement already, and I'm sure I'll get better at it with practice.
Cheers
Stephen
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