You ever heard of a guy testing a ladder jack on a job site in St. Paul, and the whole clamp assembly just let go while he was setting his plank? He said it sounded like a gunshot when the spring shot out, and he nearly went over with it. Turned out someone had swapped in a used bolt that looked fine but was stripped clean, and it was only holding by about two threads. He checks every piece of hardware with a wrench now, even the stuff that comes straight out of the box.