Hi Philip.
If "I" tried to make a mainspring, I would just end up with a glob of metal LOL.
My gunsmith does all this type of work, making springs, etc.
Tony is right. I've never seen welding one piece to another turn out well. You end up with two different spring tempers. Better to have a complete new spring made. And that you have the basic "root" of the spring, and a detail of what it's supposed to look like, makes the job much easier. The "spring" in the temper for a snapping matchlock would be much lighter than the spring for a flintlock or percussion weapon.
I'll send you a PM with a couple ideas.
Rick
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