Okay, as of today, I can attest to the magical transformation (i.e., hardening effect) of hammering brass strips. I am fabricating an 8x10 reducing back for my 7x11 camera and thus needed a slim, 1/4", top and bottom above/below the ground glass frame. I bought a pair of K&S Precision Metals 1/4" x .064" brass strips to use for the GG springs. My first attempt was a bust--when removing an 8x10 film holder, the springs bent. I removed them, hammered them, then reinstalled. Abracadabra, the brass was transformed into a spring. If I hadn't seen it with my own eyes, I wouldn't have believed it.
https://www.bladeforums.com/threads/.../#post-1303170
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