Ip engineering should be able to supply the cranks and coupling rods have a feeing mamod coupling rods might fit too. I'm after some steel rods as well but none seem about.
They aren't bad, however if you don't get the gears meshed correctly (which sounds easier than it is!) the worm just strips the crown wheel Did it about 3 times for me...
I was advised by the elctronics whizzes on this 'ere forum that you need somewhere bewteen 35:1 and 50:1. NiMh work better when the motor's whizzing and not grunting
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