Another option for small parts is to run them in a glass beaker or jar sitting in the basket. Someone could use a different solution or less of it than in the main tank, and even run tap water in the tank. I'd think if a leaf spring broke after running in an ultrasonic cleaner, it was either on its way or possibly the wrong solution was used. I think there was a fellow that commented not long ago about damaging a receiver finish with what turned out to be a solution intended for brass.