Need a flat spring for a project ?

Nice idea, Bill. As well as holding parallels in place in a milling vise, they also work well as parallels themselves when holding parts that are too skinny for normal parallels. The width is very consistent - especially if you shear two pieces that are adjacent in the band.
 
It is important to have the same temperature throughout the spring when hardening and tempering. If you don't have access to an oven, a molten lead bath provides a uniform temperature for the tempering process. The melting point of lead is just about ideal for springs. If there is a small amount of solid lead in the pot, it will ensure that you are close to the 621F melting point. Remember that lead is toxic. Clean up properly after use!
 
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