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Great suggestion, its certainly possible.
I have the books Astronomy Hacks and Starware 3rd edition, which I've read over and over. One of the last steps in the mirror cleaning instructions is to rinse the mirror with a mix of distilled water and a drop of detergent. So maybe there is some residue left. I can try rinsing the mirror again, this time with distilled water only, probably not till the weekend though.
The flaring is consistently off to one side. Stars looked fine as did the few clusters and nebulae I've been looking at.
Does the secondary have to be perfectly centered looking down the tube? I completely disassembled and cleaned the scope also, and probably put the spider vain in a different orientation from before. I asked a guy at Bintel this once and he told me not to worry about it. That was when I first got the scope and was still fighting the collimation demons.
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