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What are they made of and what’s the heat treatment?
Heat treating mild steel will do little.(the larger diameter still wins)
I’ve made a few small leaf springs recently the heat treatment then relaxing process is really tricky. At the end you give them a squeeze with a pair of pliers and they might squash, they might shatter and bits fly across the garage or you might have done it just right.
Dibble
dangeek
In theory which is stiffer: a heat-treated 26.0mm bar or a non heat-treated 31.8mm bar?