My Bruder conversions, Tracked skid loader and Bulldozer.

[scottyk]

I made those on my 3d printer, but they are very simple plastic strips just super glued into place. You could duplicate it simply by cutting or buying strips of plastic. Helps ALOT with traction but on carpet they grip almost too well and can bind it up. I've broken a transmission already with it and now I have a pair of transmissions that have a built in fail safe "torque limiter" built into them so hopefully that will save them. Works great on surfaces its designed for, light dirt and sand