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There was a thread on how to set up a GSO CC on CN a while ago. A cheap and excellent solution to the coma problem.
The solution was a 19mm spacer between the lens and the body of the CC and a 10mm 1.25" adaptor on top which added the required 30ishmm to the CC. 2" eyepieces need a parfocal ring on the eyepiece.
My ESHR coma corrector stays in the same place 19mm screwed out for all my 1.25" and 2" ES 68º eyepieces.
I can't cut and paste the thread but it is at the moment on page 8 of the reflector section on CN titled 'Setting up the GSO coma corrector'
Matt
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