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What Ponders asked.
Plus, Your GM8 will have a GM8 saddle, or a G-11 saddle (also known as a D series)? Cos this does make a difference.
Having been down the "build it yourself" road I would offer up some advice. My copy of what Losmandy calls a DSBS is HEAVY. I have it away at a weight loss program this weekend as it happens, BUT it is still heavy. Maybe determine what you want with "two refractors next to each other" and we can fine tune the concept. I used mine to allow a scope and a guidescope to be used. This was necessitated as the scope(s) that I wanted to guide didn't lend themselves to any other method. I didn't want to bore a hole to mount a rail etc.
If you have a refractor, with rings, consider mounting the other refractor on the top of the rings, with another rail or similar. Less weight, although the "weight" is further from the pivot.
Make sense??
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