OK so it's working ok. I had it off and got the dremel on everything, no paint or rust. In the hole, on the sides, on the frame, on the stand. I also noticed that it moves ok without the nuts on, so I've got them on at 20Nm now instead of 30, which I'm hoping is ok with the lock nuts and threadlock.
It doesn't seem bent, I've added pictures to the gallery:
Thank you all for your guidance, lots of good stuff on here.