I have a Williams Optics Megrez 80mm mounted on top of my carbon fibre C9.25; and WO refractors aren't light!
I put Losmandy dovetails on the C9.25 to attach it to the mount, and put the larger 4" wide orange dovetail rail on the top of the OTA. Then I put Losmandy 100mm "O" rings on the top dovetail and slide the refractor in there.
I am not sure how wide a vixen dovetail is, but I think 4" wide is a minimum when you are mounting one or more heavy scopes!
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