If there are any members in the Echuca area, I'd appreciate a PM - am looking for someone to help me hone my (beginner) collimating skills. Have a Bintel 10" dob and am having probs getting everything "just so"....
Like I just posted in another thread, have a look at this video tutorial: http://www.andysshotglass.com/Collimating.html
and don't be alarmed if the spider does not look centred when you're finished. It shouldn't, because of secondary offset.