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Mount a ring or clamp around the back of the big OTA directly under the DSLR, then screw a long bolt or threaded rod (same diameter and thread as the DSLR mounting threaded hole) into the top of the ring/clamp and the other end of the rod into the DSLR mounting threaded hole, lock with a nut on the rod up against the bottom of the DSLR and another nut at the bottom.
It looks like you can swivel the small OTA mount adaptor, if so you will lose that ability (cant see why you need that anyway).
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