Why bother? Ships haven't used riveted construction, needing upset
caulking, for many years. Old boilers, maybe.

Bob Swinney
"Bugs" wrote in message
oups.com...
Get some leaf springs from a wrecking yard. They will last forever with
a good hardening & tempering, I have rock chisels I made forty years
ago still in excellent condition. Oil harden & draw to light blue
spring temper. Any harder & the striking face could chip.
Bugs