Hot wound spring.
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2:32 source video:
https://www.youtube.com/watch?v=nauLVPsaXM8
Previously:
https://www.homemadetools.net/forum/...5965#post82842
Hot coil spring forming GIF
Detailed springmaking guide
Spring forming GIF
https://www.homemadetools.net/forum/...3929#post79023
https://www.homemadetools.net/forum/...3498#post78183
https://www.homemadetools.net/forum/...ming-gif-53633
Spring forming machine GIF and short video
