[Kevan]

I tested it, spent an hour adjusting it after it started handling funny on left handers and sounding like the inside rear tyre was lifting and hopping.

Much adjusting and testing and time also spent on one of our Rally stages I found the problem, a loose rear axle tube.  It needs gluing in situ but fixed it firmly enough to race...
...3 heat wins and overall class win on it's debut against a tough opponent too 

I'll post a video tomorrow