slight problem on the first run of my brothers durga

[andy_n]

well he let me build it so we went for the maiden voyage and it didnt end well
i wouldnt say we were going stupid with it but we gave it some slight speed runs and so on as you do found that the steering was pretty poor
any way we noticed abit of slipping and assumed it was just the rear diff abit loose nothing to worry about wasnt that bad but then all power went from the rear wheels
and we took it in bits to find this




any ideas how it happend ?
or where we can get spares from ?
cheers
Andy