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Thanks Peter.
many talk about inserting the camera, spacer and mpcc with just the mpcc body at the focuser brass ring stopped by the collar, but that would mean the focal plane would be around 110mm from the ota surface, so mirror to be moved up, bigger secondary, bigger focuser.
I don't see why it can't be removed.
Anyway, I think coma is not too bad in my case, it was more field rotation, but I'm pretty sure that's because I was polar aligning with the guidescope not the primary scope, and both were not aligned, plus the ccd tilt which I just fixed, as well as the diagonal on the guidescope and finally my collimation.
fixing them one at a time.
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