[QUOTE=silv;876213]bugger - so many good questions there and almost no answers...
read
this article - and can not - will not - must not - move the primary. Cutting the tube? Never!
But it mentions the other gear to achieve something similar:
low profile focuser and Coma corrector.
Intriguing: the focus point is
closer to the secondary - contrary to my afternoon experiment.
Arif, you solved it with springs and long screws? Did you follow any internet article when doing it?
magical optics ...[/QUOTE
I read the following review for my modification
http://www.cloudynights.com/item.php?item_id=1677
If need to calculate how much back focus you need and then church the low profile focused height. I did mine because I wasn't sure the low profile focuser will solve this profile.