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1966-2013
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<-- stands quite deeply on Russ' side of the room regarding annealing coppers and hands him a beer while loitering.

I've been doing it since my old Brit bike days with those copper washers, shims and especially the head gaskets those things are laden with.

I tend to quench in old motor oil (you know, what you just drained sitting there in a pan) as it gives a better cooldown IMO. (water is a bit too fast while air is a bit too slow. Oil keeps it a bit warmer for slightly longer than water would which promotes more even cooling)

You can anneal an unlimited amount of times provided the copper is in good condition/not gouged up.
 
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