You guys buying old USA, pre-foreign made tools that aren't made in the US any more: what is your plan when the tool breaks? Warranty wise.
I think if you're asking that question, you might have missed the point entirely on why some people prefer to buy old USA made tools 2nd hand. It's not about warranty. I think it's about buying a higher quality tool ; although, I don't always assume "made in USA" means higher quality, it some times does. Also, buying 2nd hand tools usually means you're paying a lot less... so much less, you might even be able to buy an extra one or two for repair parts or self-replacement when the one you're using fails.
Buying a tool with a "lifetime warranty" (which means the lifetime of the company, not the owner), is not always the best way to own a tool. It's the way a lot of tool manufacturing company's marketing department would like you to think is the only way to own a tool, but it isn't.
Same goes with a lot of other situations too... like owning a used car out of warranty; if it is cheap enough that after adding maintenance/repair costs of the vehicle it is still more affordable than buying "certified pre-owned" or "new", it makes sense to own. Those required maintenance/repair costs depend on the quality of the vehicle... if it was a solid vehicle with very little problems, was well maintained by the previous owners, or the repair costs are cheap; the numbers start to make sense. So, if you have a used, but better built tool that is likely to last you a long time before it wears out, at a "used tool" price, even without warranty, it makes more sense than buying brand new, low quality, with lifetime replacement warranty.