I converted a 2-axle aristo bobber to a track car - basically copied A Kramer's method, but used drywall screen. Part of the trick is getting the right amount of weight on the pad. The pad face is 1/8 Finnish birch ply, with a hollowed out block of wood above, in which big washers are bolted for weight. It floats on the track, and after about 3 passes, glitchiness disappears. I made a REAL NICE aluminum support plate for the drywall pad, until I realized I was going to run it on powered track.... oh, well. Hence the plywood.
However, the best method remains the drywall sander pad on a pole - A bit more work running around the track with it, but also does a much better job. If I'm lazy, I'll run the car, if I CAN'T run the car, out comes the sander/pole.../DesktopModules/NTForums/themes/mls/emoticons/blush.gif