has any one broken knuckle arms? i haven't yet, but they look vulnerable, and flimsy. if so when you buy them do you get 1 or 2? what steering parts do you guys break most often? i usually just bend those little rods, but my vice fixes that nicely. i read that people have a problem with breaking fuel tanks. is that true? can a hpi or losi or another brand tank fit? i bet with a few new holes in the pan about any tank will fit.