Hi Alex,
I've been a bit quiet in your thread for a bit, dealing with minor health issues myself (runaway heart rate in particular, probably thyroid) and caring for my partner (she's had a knee replacement). Nothing in your league though.
Anyway, if the tracks are out of parallel now, most likely cause, not having seen things, is frame shift- just my guess.
If you can't shift the tracks slightly that's a bummer.
I've also been watching your journey in this project as it looks like my big dome observatory will have to give way to something smaller not far off, and a ROR seems to be in the offing.
So, take heart in thinking that, if nothing else, you can serve as a bad example for others!
Take care, mate!
Neville
LSO