I've had the chally apart to install some weights, and the gearbox gears are made from a magnetic metal - I assume that'd make it steel and not pot metal.jarndice wrote: The Heng Long "Metal Gearbox in your Challenger is probably pot metal and should be replaced as soon as you can afford to do so,
It is far worse than the Nylon gearbox it is advertised as an upgrade to
before I mod the top to be detachable via magnets I may actually aquire one of Mr. Ludwig's chassis brace kit - the tub seems comparatively floppy without the top on.
