And your purpose for the heating and quenching of the stock lug? Hardening? I don't think this is necessary. The stock lug doesn't get much abuse, and I imagine that it will last a very long time unless you are sure that the new lug is very soft steel... If that is the case, then hardening might be in order... and the temperature you mentioned should not cause any damage... but I would only do this as a last resort if you notice that wear on the lug is occuring.
What did it cost you for the machine work?
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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