How big a torsion bar nick is ok?

My Buddy's RoadRunner was just sitting in the driveway, he was in the house and heard huge bang! When he went out to look he found his RR sitting low on one side, the damn T-Bar broke as the car was sitting! He had just returned from a ride. So these things do go bang big time when they go....I would just get new, why take the chance...sell those ones you have to those guys that think the bar is ok..let them run them ;)
Mom and dads Fury Sport was the same way. Sitting in the garage and heard a bang went out to see what it was and the car was down on the right side.