[Stonius (Markus)]

I think I finally nailed it.

My problem was I was too scared to change the height of the secondary before but I felt more confident having read through the mentioned articles (thanks guys!). That was a big difference. I tweaked one of the vanes too, to center it, but the trick that got me back on track was to grab a laser pointer and point it into the Cheshire eyepiece.

It took me a few minutes to realise the laser while having a wide, flat face (which enabled me to hold it at 90 degrees to the eyepiece) wasn't, in fact, propagating at 90 degrees. After a few paper shims at the eyepiece (yes, dodgy, I know but it worked in a pinch!) I managed to get the laser hitting the crosshairs at the bottom of the Cheshire. From that, I fiddled with the secondary until it projected the laser dot onto the primary centre spot. Then I went and checked the Cheshire visually.

From there it was pretty much textbook. Can't wait to take it outside and see the fruits of my labour :-)