Well, they say the third time's a charm. But I hope in this case that never happens. I think I finally learned my lesson. That is, NEVER use anything to extend the leverage of the vice handle.

My brother gave me a large, 6 inch, made in Poland metal vice for Christmas 46 years ago. In all that time I'm sure there were times I used a short pipe as a handle extension and never had a problem. That is, until 2 years ago when the additional leverage caused the vice to break.

I was lucky in that I was able to repair the vice and life went back to normal. That is until a few days ago when I had a brain lapse (or maybe a relapse) and used a pipe extension again. And yes, I broke the vice again. I took this picture of it broken but not before I already ground my bevel on one of the pieces.
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I was able to weld it again, paint it and put it back in service.
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And here I thought we get weaker with age, or maybe the pipe just got longer.