308 RF spindle threads

I messed up guys, I didn't realize the right front spindle on my 85 308 was left-hand (i.e. reverse) thread. Hit it with my Milwaukee impact and it started spinning. I was able to get the nut off, but the spindle threads are not accepting a new left hand nut from Superformance. I've tried to clean it up with a thread file (seems it's 1.5 pitch) but am considering getting a thread repair die to clean up the threads. They aren't that far off, just need some help.

I measure the spindle threads at about 17.7 mm. Pitch of 1.5. Is this an M18x1.5 left-hand thread?

Thank you, embarrassed to make such a rookie mistake.
Mike