Well, I appear to be OK. I ran a new die down over the bolt / slide and a new tap through the threaded hole. I was then able to thread a good M10 x 1.25 nut over the bolt / slide, and I was able to screw a good bolt through the threaded hole with just my fingers. Everything felt smooth, so I put it back together with new grease on the slide and a bit of anti-sieze on the threads. Threads felt good going in place, and I was able to torque them to the 19 ft lb prescribed in the manual. I'll keep it watched, and I do still have the used unit coming as a fall-back if necessary.
Next, I'm planning to install the new front tire and brake pads Sunday. I hope I don' destroy anything there. LOL
Thanks again to all of you for your input. You've been most helpful.