Have a look at LAW42 for an alloy servo arm. No real need for it as I've never had a problem with the kit plastic version.
Be interested to see how you get on with the esc at rear of motor, most would run it to the front. What surface are you racing on with the ZX6. I race on grass and was considering trying the esc to the rear, but being honest the car is so balanced with it to the front I really need to convince myself first.
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