Fabricating and installing the new spring

I tested several different materials for the new springs and I ended up using 0.025" MIG wire.  It's nice and pliable and can hold its shape when it's positioned to distribute force well.  

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Finished spring

I made a spring winding tool with a block of maple and a piano balance rail pin and wrapped three times starting at 6:00 and ending at a 2:00 position.  

Next I threaded the standing end of the spring into the retaining hole and used a toothpick to pin it in place.

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Finished spring

I trimmed the wire below the flange, glued the toothpick into place and clipped off the excess.