I don't know if you guys know what a winch bar is? It makes a breaker bar look like spaghetti. It'* a thick-walled steel tube about three feet long and 1 1/8 inch thick. One end has a knurled bar welded into it and bent at an angle. This end slots into the winches on a flatbed trailer and lets you crank them down tight.
The other end has an odd looking arrangement of bent plate steel designed to slip over the handle of a lever-type chain binder. (A lever-type chain binder is an iron bar with two hooks on the ends of shackles that attach to the bar in such a way that pulling down on the bar tightens a chain that it'* hooked to.) The winch bar lets you tighten a chain binder to the point that you can ring the chain like a bell.
I tighten my chains by hooking the binder in, then slipping the bar and pulling it straight down. I weigh 270+ lbs, times 3 feet of bar, that'* `810 ft-lbs of torque applied at the end of the bar.
Three days ago, the end of the bar broke right at the weld. That piece of plate metal that goes over the binder flew about 50ft straight up, and if I hadn't been wearing my hardhat, I'd have given myself a concussion, because the rest of the bar smashed down on my head with the full strength of my arms pulling on it.
My neck is still stiff from the impact....