On Alex's superlight X-6, we are running a 3mm CF motor plate. Our motor screws screw directly in to the CF with no backing nuts. First, we threaded the holes in the CF and then just screw them in. They are holding well and if any get loose, we put a drop of CA in the hole and it holds just like there was a nut.
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X-Factory SCX-60 - Keep On Truckin'
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