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"RE: Markins Q20 + TB-20 + Gitzo 1220"
Hi Terry,The Panning base of the Q20 is 68mm (2.68") in diameter.The TB-20 is 63mm (2.48") in diameter at the top.The Panning base of the Q10 is 62mm (2.44") in diameter.Either head is usable with the TB-20.Good Luck and Enjoy your Nikons!