BLING POLISHED SPINBRUSH MOTOR!!!!
After I failed using the soldering iron heat up and pull the pinion off method, I bought a pinion puller from horizonhobby.com
I suggest if you're going to take on this mod, pick one up. However, please read on before you make your decision.
Microspeed stated that the motor might be faster than a Stage 2 if the wheels would stop spinning. I disagree with this statement. My dad ran his S2 drift motor right along side of mine with the spinbrush and the S2 top end was a bit higher. I could already tell before he even ran his. I'm using hard treads on back and stocks on front with AWD and I did not have the problem with getting traction on my tile floor. Even the basement floor wasn't too bad. It eventually hooks up there too. I definitely agree about the torque. It has quite a bit of power. I was able to control drifts with much more ease than the S2 drift motor. I really didnt notice any difference in the loudness of the motor either. It was just as loud if not a little more quiet than the S2 running with it.
As far as a tutorial....get the pinion puller and save yourself a ton of frustration. You just have to take wire cutters and pull the motor shaft out enough to be able to get the pinion puller frame between the pinion and the motor. Then just simply tighten the screw and watch the pinion slip off with ease. I then put the pinion on the spinbrush with my craftsmen hobby vise. Very very easy. Don't forget to file the motor case down where your solder points are. This gives the solder a better contact surface to stick to. As far as soldering goes, just get the solder at RS with the flux in it unless you prefer the other more difficult method.