Hi Gary
I asume that your GM-8 is new, if so it will come standard with the Losmandy 'D' series saddle. Might I suggest that you think about the idea of turning the saddle 90 degrees and just use a DUP plate, it has a number of holes already drilled and a long 1/4" wide slot. If necessary, drill and tap to suit your clamshell. Will save the extra weight of additional pieces of metal.
Just a thought.
Cheers
JohnG
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