We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Andy Dingley
saying something like:

Its probably not cast iron anyway but mild steel.

No, mild steel rusts through too quickly.

Not if it's 6mm thick to start with. I have a rescued BB that's 20 years
old and still plenty thick. I intend to re-use it and expect it to last
for many years yet.