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You are correct in your thinking Bob. The spacers are not the original, the lengths are different and a couple of different thicknesses which initially worried me. The movement in the corrector plate is about 1mm or less with those cardboard spacers in, and that's 1mm too much. I had a quick look through it once I put it back together during the day time and it's a surprisingly good, clear and sharp image although looking at the stars is another story and I'll most likely need to adjust the secondary to get it spot on.
I've never used a collimator before as I've never felt I needed to, mostly had 8 and 10" reflector dobs, 4 to 8" reflectors on EQ mounts. There seems to be a little play with both my standard collimator and my laser collimator, pointless having them really. I'll do the out of focus bright star adjustment on the secondary as it's the most accurate for me.
I bought some David Gray's distilled water yesterday. I'm looking to do the primary mirror clean tomorrow when I get a spare hour or two. Just trying to work out the ratio of water to dish washing liquid... and which brand as they are all different :/
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