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Tim,
If it hasn't had a lot of use for a while, the glue/ grease on the baffle will need some spreading....
Run the focus all the way out and back all the way in a few times.
This usually improves any mirror slop. The 12" has a weight balancing spring and I've found the slop on my ol' 12" to be minimal....
Invest in a set of Bob's Knobs - makes life much easier.
Also check that the allen screws on the corrector retainer ring are ONLY nipped up - I found on a 10" I was inspecting that they had been REALLY tighten up on one side and pretty loose on the other - the Ronchi screen showed two distinct areas! After loosening the screws and resting overnight it came good.
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