You mean like to temper them so they don't bend out on the massive hawgs they hook when they re-emerge like a Phoenix, stronger and more magnificent than before?
I know, it ain't a chironomid. I wish that hook had a better temper than it did. I hooked and landed the biggest rainbow of the year on this fly and then missed two fish, hard strikes with the fish on for a second or two..... before I "checked my fly". The bent hook fly rests on the bottom of the Giant Cataract Lake.