Another alternator problem

Maybe the odds are better or maybe you have just been lucky. I've been through a few 12SI in my wagoneer. Feb 2019 made the last hour and a half back into town on battery alone thanks to the junk output stud insulator and lack of QC - from a AC Delco with GM numbers on the box. All rebuilds, remans, etc are a crap shoot.
Years ago I rarely used electrical stuff from a junkyard. Now, if its original and in OK condition, its my first choice. shake_head-gif.gif

Here's the insulator. That's not loose! Junk.
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This was exchanged for an older AC Delco 'rebuild' which did not have that issue. Yes I opened up and checked it out. Had to clock it anyway.