I just thought of something. What about a design flaw? There should have been some type of stop to keep the bar from falling past a certain point. Also if a weld were to break on the tensioner mount and cause the subsequent failure, that would be considered manufacturing defect. If something where to built to last a lifetime, then it should last a lifetime, no matter of wear and tear.
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual