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Thanks guys a film canister is a great idea - I will get hold of one and do this.
I actually adjusted my secondary mirror with the primary removed so I was looking straight out the barrel of the scope casing. I adjusted it so as to centre it about the scope casing by eye as per diagram B in the link Mental provided.
I watched a couple youtube video's and when I cleaned the mirror I did pretty much what is described in the link Malcolm provided. I used a ring binder reinforcement ring to mark the centre of the mirror as it didn't have anything marking the centre. I used some baking paper and a compass to make a template and placed it pretty accurately in the middle.
Thanks for the tip about the mirror clamps - I was wondering about this when I was doing them up. When I took the mirror out they were really tight so I did the same when I reassembled it. I think I will take it back out and loosen them off - no need for them to be this tight and it is probably distorting the mirror. What kind of effects will be evident with a distorted mirror?
I had to laugh at the two camps of mirror cleaning - the guy I bought the scope from is definitely in camp A and I am definitively in camp B LOL.
Thanks for the tip on the General chat forum Alex, I will ask for some help with borrowing an EP there.
TAHAIC
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