Admittedly I have a C8 - not an EdgeHD - but it has Losmandy D bars top and bottom. The tube came with drilled and tapped holes on top - blanked off with plastic plugs to stop dirt ingress. The front radius blocks only took one screw. The rear ones have two. The blocks and dovetails don't interfere with the finder mounting holes.
My CG5 has an ADM dual saddle and my G11 a Robin Casady saddle.
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