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Thankyou, I am sure you are right although might rotational weight be less of an issue in a slow crawler? The extra value of the hex extenders is in widening the wheel base - But yes this all puts more strain on the servo. Like many here I have swapped the servo for an emax and I replaced the...

You are right but I do remember feeling a little frustrated by its tendency to side tip on slopes. 4 hex extensions on the axles widen the wheel base and make a huge difference for little cost. Also a little weight on the wheels. Brass wheel inserts are recommended but i just use plumbers solder...