The 18 Obsession UC has alt encoder bracket fittings and tangent arm that are quite compact and easily fit. It fits a scope just like yours, with the "virtual" mirror box design. If you wanted, you could email Dave Kriege (his website) and ask if anyone can send you a pic of the alt encoder bracket for the 18 UC. Or join the obsession_users yahoo group, and post that question, and within 24 hours you'll have someone post a pic on the Photos section.
But, then again, it'd be kinda fun to see if you can out-kink that friction-wheel design concept...I like seeing folks pursue different angles, because we learn by each other's trials and tribulation.
Please post an update to your efforts in the future, so we can all see the result!
Regards
s
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