For future reference, YouTube has 3 or 4 excellent videos dealing with making, rehardening and retempering small flat springs identical to the type shown by the OP. I just yesterday rehardened and retempered the original small flat spring which holds tension on the "snap on" type forend latch of a 1909 Fox Sterlingworth. Pay close attention to the different color hues as the work is heated; the color changes signify the proper time for quenching as well as retempering. It is not at all complicated if you follow these rules.
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