I've got an old service manual from the 1930s stashed away somewhere that shows a bumper bending jig in use for installing a spring steel bumper on a vehicle. The bumper is almost straight when it's unloaded, and it takes a jackscrew device about 3 feet wider than the car to bend the bumper to the right arc to bolt it to the frame brackets!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!