Fitting the Sand Scorcher wheels should be simple. Put them on the stub axle, do up a retaining nut, and job done.
At the back, that's how things works. Yes, you have to juggle a metal hub in place, but this doesn't quite require three hands.
At the front, on when the first wheel, and when I spun it, it was catching.
Investigation revealed that I'd used the wrong bolts when assembling the wheels, and the once I'd fitted were just long enough to stick out of the back of the hub, and catch on the steering arms. No problem, just a bit of grumbling at my own stupidity, and these were changed for fractionally shorter ones, that don't quite reach the end of the nut now.
But this still didn't solve the problem entirely. Something was still catching. Running the wheel inside out (wheel front facing into the car) fixed it, but that would just look odd. Moving the wheel around a little, allowing a little slack on the axle sorted it, but that's not an engineering solution. A 2mm thick plastic washer is though, in my mind at least, so I made some up, and not everything is tightened up as it should be.
Obviously, I'm worried I've done something wrong. Tamiya don't make this sort of mistake, do they?
Anyway, the car is now up on its wheels, and has been test run up and down our hall. Happy days!