David,
I am also having some intermittent tilt and curvature issues with my FSQ. I had hoped they would go away when I got the last couple of adapters needed for a fully screwed together optical train, but alas they haven't. When I figure out what is going on I will let you know. So far my reasonably methodical troubleshooting attempts haven't resulted in a Eureka moment. I'm wondering whether I might actually have more than one problem...
Good luck with your troubleshooting!
Cheers,
Rick.
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