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Sorry guys, I squeezed that post out just before heading to oncology at Randwick POWH, it is a four hour trip each way for me, so I was in radio silence for the last 24 hours!
I'm home again now so I'll take some pictures and post them today.
A couple of caveats.
1) The threads are slightly different. The GSO focuser fits, but unfortunately none of my other SCT focusers do (I would have loved to use the electric ones). Also there is a small amount of slop in the threads, but some plumbers thread tape seems to take care of it.
2) You suddenly have no way to mount your PST, if anyone can point me to some suitable rings or some other idea, I'd really appreciate it, I can leave it mounted in the finder-scope!
3) The back filter happened to have the exact screw thread of my Celestron diagonal eyepiece holder, but nothing else seems to have this thread. This is annoying as the diagonal isn't the best. What I ended up doing was removing the BF from the eyepice holder (amazingly it pushes out) and putting it inside an old barlow with the barlow lenses removed. This works well and allows me to position the BF for maximum CCD coverage, as the little 6mm is annoyingly small.
Other than that, it really is a revelation, with the astigmatism gone, the PST is a much better performer. I've seen PSTs that have no astig with the stock focuser, so your mileage may vary. It is also worth opening up your black box (hex bolts on the the size panel) and see if your prism is dirty/crooked/loose, just adjusting it can give better results too.
I'll try and grab a photo at lunch time.
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