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sd, do you really think a #10 screw is going to still exist after a lightning strike?
I'd suggest a tin snips and a sheet of bronze or copper scrap followed by a little handwork, to make a "washer" and crimp connection that are robust enough to last a little longer.
Plumbean, I think most battery cable terminals are still lead. Again, they'd just melt apart after a first strike. The ones that aren't lead tend to corrode and not conduct terribly well. Still, if you can get a good connection with good contact area, and grease it up so it doesn't corrode....beats nothing at all, doesn't it?