[Omaroo (Chris Malikoff)]

Steve - I have the long tube version of yours, and I'm mounting a red dot finder in addition to the included finderscope today. I plan the remove the rear focuser assembly, drill two holes and mount the standard Synta-style dovetail bracket. It's no biggie to drill the holes, and if you keep the bolts short they won't interfere in the path of the light cone at that point.

I wouldn't mount one to the rings as there is too much inherent movement between the scope and rings if you want totally repeatable mounting each and every time.

Photo 1 is the end of the tube with the focuser assembly removed. As you can see, the quality of these things is nothing to write home about. They are basically a steel toilet roll with a lens at one end. The chipped paint is from their manufacture - not of my doing. I drilled the holes and vacuumed the insite of the OTA to make sure that all swarf was removed.

Photo 2 is the new dovetail monted, with the whole thing reassembled. Now I have both the original finderscope and new red dot to guide me. The distance up the tube that the new red dot is mounted is perfect - such that when you go between them you don't have to refocus your eyes as the red dot is far enough away to see the dot at infinity.