Stretching a compression spring - GIF

Stretching a compression spring.

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Previously:

https://www.homemadetools.net/forum/...372#post208446
https://www.homemadetools.net/forum/...000#post202899
https://www.homemadetools.net/forum/...365#post196527
https://www.homemadetools.net/forum/...001#post183994
https://www.homemadetools.net/forum/...320#post177168

Huh!
I thought they were made to exact specs originally, not modified a bit.
Like in this video that I made years ago: https://vimeo.com/manage/videos/76554389

I thought that were made like this.