Find a 1 1/2" open end wrench at a pawn shop or a flea market, and spend some quality time with an angle grinder to thin it down, then adjust the opening to fit the flats on the nut.
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!