After about the 7th thread on this, I checked my jackstands and found that they didn't come from Harbor Frieght. Better yet, they don't appear to have the issue that the recalled stands do.
This YouTube video explains what the problem is, and is a good tutorial for checking your own jackstands.
https://www.youtube.com/watch?v=cwcWdKwPvhI
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1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.