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Thanks for all the replies.
The collimation sites mentioned by Davidpretorious were very good. Unfortunately I'm still a bit confused. The military man said the first thing you do is adjust the secondary alignment. The other site said whatever you do don't adjust the secondary alignment.
When I soon get my hands on a cheshire/sight tube collimator, before collimation should I adjust the secondary alignment?
I was thinking that if I take a photo of the focuser view with the cheshire/sight tube attached, you experienced guys could tell me if it needs adjusting. Would a photo without the cheshire/sight tube be of any use for this purpose. I'll include it as an attachment anyway, just in case.
Perhaps I should do what the military guy said and just jump straight into secondary alignment.
I'm definately going to make one of those masks. A fan sounds like a good idea too.
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