That thread linked by Durham discusses the balance rings, which are fluid filled. This is the case also with Whirlpool DD. Sort of like hydrostatic flywheels. But there is apparently a coefficient of weight-of-basket to weight-of-balance-ring fluid. If any fluid leaks out you get wild-ass gyrations instead of nice smooth spin. This explains the problem we've had with three successive Whirlpool DD's, I do believe. Nothing worked to correct the hippy-shakes - not pads, not springs, not lube, not nothing.
Fortunately on DD's, no harm is done. They can fandango right across the floor to the other side and come back for more. Right now I've got one that even broke a weld to the cover and it still soldiers on. Woe to anything that gets in the way, of course.
Cabrio, I don't know. Maybe they self destruct that way.
First, do no harm.