Hi Dennis - You can see my set up at
http://www.iceinspace.com.au/forum/showthread.php?t=65 somewhere down the page there are a few pictures.
The FS-60c is now being held with some proper guide scope rings so I am hoping I will have no flex.
My STV is used with the FS-60c at 355mm so it will give me 5.2"/px this is more than enough to give me suitable guiding for the FSQ at 530mm FL which has an image scale of 3.5"/px
My quick calculations tell me at 2' error on the PAS I should be seeing a field rotation of about 15" at the edge of the FSQ frame. I will do it more accurately later but that seems workable. It is even better if I can get closer than 2' by drift aligning.