Making several shallow slots in the pinch weld about an inch apart with a thin cutoff wheel on a small angle grinder makes it easier to roll it up in a uniform fashion. It reduces the amount the metal has to stretch as it rolls.
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!