From what I understand the parts have to be packed in bone meal and then heated! It is a rather involved procedure. I have seen an explanation of the procedure in a shotgun magazine called "The Double Gun Journal" It was in an issue several years ago.
You might want to drop in on www.gunshop.com
they have a BBS and might give you a more detailed explanation of traditional Case Hardening.
Geoff Ross
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One reason to vote in the next Presidential election.
It's the Supreme Court, Stupid!
[This message has been edited by K80Geoff (edited March 29, 2000).]