pyotr filipivich wrote:

In those days, I was so skinny I had to run around in the shower
to get wet.
After that "exercise routine", I was much more careful. I figured
I'd had about as much of such excitement as I could stand for one
lifetime.

I hear ya.

But what would you have done differently?

Braced the blocks against shifting, somehow?
Use a steel plate under the jack stand to spread the
weight over many cobblestones?

Get an MBA and be an accountant rather than a wrench?

--Winston