Your slipper's at the back?
What you need to do is get a small screwdriver and slide it down inside the drive cup beside the wee nuts. This will prevent them from turning. It's not ideal locking up the slipper, but it'll last longer this way. If it slips too much it just overheats, melts and self destructs.
If your slipper is at the back, the motor must be at the back too. Hmmm. I've had a look on the Answer website and I think you've got this one! I've never seen this before.
http://answer-rc.com/uk/en/1291-cast...th-buggy-.html
This is indeed a new kit as it has the new style wheel hexes fitted! Interesting! Looks pretty good. Keep us posted. Oh yeah, because it is entirely different from the previous car and the current pro car, I'm not sure how 'upgradable' it'll be....
Jimmy