Compressing a heavy duty coil spring.
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Previously:
https://www.homemadetools.net/forum/...3929#post79023
https://www.homemadetools.net/forum/...024#post129812
https://www.homemadetools.net/forum/...384#post146537
https://www.homemadetools.net/forum/...4544#post80121
https://www.homemadetools.net/forum/...2843#post76974