Hi,
The end you want to quench down should get dark to medium cherry -red.
Use a wet rag to save the rest of the spring and your hand, than quench it down immediately 100% upright on a warm/ hot steel-plate. ( a cooking-plate works great )
You should temper it for a hour at 180°to 190° Celsius in your oven , but you should not trust the marks on the oven-knob.
Jochen
Needless to say that the spring has to be 100% clean?
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