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Robert,
If the mirror is shifting - well that could throw off a polar alignment by my reckoning. So when I switched back and forward to a side mounted MAK and got different polar alignment correction data (from PEMPro's polar alignment wizard) on the same target at the same elevation to me that says the mirror is moving. The PE PEMPro describes as under 2 arc seconds corrected - which I find hard to believe. The C9.25 unfortunately has no mirror lock (unlike the Meade) but the Feathertouch focuser helps reduce mirror shift.
So if I see DEC drift on one OTA during polar align but not another side mounted one (Losmandy side saddle bars) - something unusual is happening!
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