The threads on the ball joint (which is brand new and has never seen street use) have shredded off. The nut wasn't tight - so it wasn't yet a matter of over-tightening it. I confirmed that I didn't cross thread the nut and concede defeat. I don't have another one. It's a Meyle brand part - I'd heard about quality issues on some of their other parts but figured that I'd somehow evaded the decline in quality since I hadn't experienced any issues. Turns out, I'm just another statistic. I don't think I'm going to get another one. If the threads came off that easily - how strong are they on the other 3 ? Looks like I might wind up eating the cost on these and replace them with something else. The sunk costs on this car are getting a little out of control.
Off comes the spindle because I can't leave it hanging there by the lower ball joint. The car is now back to sitting on jack stands again with one installed spindle. This is getting really, really old. In lieu of throwing tools around, I just picked up the stuff on the floor and shut off the light.
I'm either losing patience or desire.