I've got the pistons sorted out, but now another question has arisen and it applies to both rotors and hinges. Why is it that every time I make limbs with rotors and hinges, all sorts of naughty things happen all the time? The conditional leg or arm dangles from the slightest turn of the body, or other such unpleasant things. No matter how hard I fought, it was no use. I lowered the mass to zero and set drag to false. And I set the dumping high. Nothing helps.