A while ago i stumbled across the idea of blocking diffs with plasticene. I was just about to try that on a Tamiya Hummer chassis I have lounging around here. I have another silly body-building project in mind, for which this could be the right basis. But first, i want to check out how it crawls (I expect not too well). I just realized to my horror that this thing has a ball diff in the back and I wonder if the plasticene method would work here It should, shouldn't it? Or does anyone have any other good, and reversible, ideas?.