While I was waiting on my mini-mill to arrive I decided to do some concept design in (then Google) Sketchup. I was constrained by only having 8 servos on hand and unwilling to buy more with a move in the near future.

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Overall design concept.

Originally I'd planned on using two pieces to create an X for mounting but I found it to be less stable and required more machining than I'd had patience for.

This details the center plate design I wanted. The hexagon provides more mounting space than the square but I didn't have any starting pieces large enough to create the desired piece.