Good to know! Not quite to thakt level, yet. I migrated from "eye-balling it" to getting a Celestron polar axis finder. and ZWO ASI camera. Because I was setting up for the first time I thought I would go ahead and fine-tune it. A word to the wise -- probably not a bad idea. The polar finders are supposed to be fairly accurate out of the box but mine was probably as far off as it could be. Two set screws (grub screws) were nearly all the way out, and the third was in so deep that it wouldn't budge. I have micro tools so tools weren't an issue. I suggest that when you buy something that has set screws in a ring, look to see if they are all about equal. They should be. If not, return it for having a defect or attempt to fix it at your risk. I happen to have micro screws so I will be able to deal with it. But I'm not happy. Cheers and clear skies ( good luck in the UK)!