Billwojo has some keen observations about aluminum that get me thinking. I couldn't tell you which aluminum alloy was used in some of my bicycle frames. Considering that there are physical differences between one alloy and another, it seems reasonable to want to know exactly which alloy might be being used in a cantilever. I am always curious that way, even if I wouldn't know the difference between any two alloys.
Leading to my next question, that has to do with any treatment of the cantilever itself. Are there any? If so, what might they be?