n00b problem with MadRat slipper clutch

[Spiff500]

Hi All,

I've just built up a MadRat kit after *years* of being away from RC.

Overall, it's a great kit, with some really nice touches . . .

Anyway, the build went well, no problems. Took it out for a test drive; the only thing that seems wrong is that the slipper clutch is way too loose - or slipping quite dramatically.

I've read somewhere that the car should wheelie just a little, then back off the clutch a tiny bit.

Ok - my problem (and apologies if this seems really dumb!) - how do I tighten the clutch?

Everytime I try and tighten it - either the wheels turn, or the pinion or the motor. At no point do I seem able to tighten the nut on the spindle behind the spring!

So, I took the motor out, released the motor cover and using various braces (screwdrivers, metal rulers etc.) braced everything related to the gearbox and diff. Even so, now the grey round metal plate just behind the spring on the shaft rotates!!!!!

So, how the hell do I manage to tighten the nut and by association tighten the clutch!

I apologise if this is a bit of a n00b question - but it's really starting to p**s me off now