Agree with Doug, you are probably causing the problem. Usually 5160 can be run through a couple of normalizing cycles (below critical temp) to make stock removal/filing easier. Higher temp is not the answer. Another thing you might consider - the leaf spring might not be 5160, not all vehicle springs are.
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Carl Rechsteiner, Bladesmith
Georgia Custom Knifemakers Guild, Charter Member
Knifemakers Guild, voting member
Registered Master Artist - GA Council for the Arts
C Rex Custom Knives
Blade Show Table 6-H
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