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Thanks for the new replies.
I will measure the distance from the centre of the holder.
About the secondary screws, the big one in the middle is visible, but the small ones are further down. I cannot see exactly what their heads look like because they don't stick out, so I was not sure which screwdriver to use. (I had a torch but is seemed to have died so I could not check.) I am not much of a person who does a lot of manual work, so I didn't have many screwdrivers or tools at home either. But I got the allen wrenches this morning (they arrived much earlier than expected), so I will try them later today or tomorrow. I would rather not touch the secondary mirror too much right now to be honest as it seems OK, but maybe I should try anyway and have some guts...
The focusser is a cheap focusser. I plan to upgrade it one day. When I said I removed it I mean I screwed it out. I don't know if this can be done with all focussers, but mine is adjusted by screwing it in and out and it can be screwed out completely/removed. I don't really like it. When I have to screw it out to focus sometimes it feels so unstable...
Unfortunately I once asked and there are no shops around here that sell film canister caps but I could try Sydney (I intended to go today, but I was sick last night, so I didn't go).
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