It would also be possible to file or grind the original thread away and rethread the spindle for a castle nut with a slightly smaller diameter thread. (even a metric thread a few thousandths smaller) That would be a safer option than relying on a jam nut to keep the hub on while you search for a replacement spindle.
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!