You can get 2 Losmandy dovetail adapters that fit on Losmandy dovetail bars which are a lot heavier duty than the Vixen style. Then you get 2 100mm guide scope rings from Losmandy and you can mount your lens through them.
This is what I use for mounting my guidescope and it works well although the tightening knobs on the dovetail adapter can break off part of the knob easily.
Greg.
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