Thick leaf spring stacks.
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Previously:
https://www.homemadetools.net/forum/...886#post223864
https://www.homemadetools.net/forum/...3929#post79023
https://www.homemadetools.net/forum/...791#post156081
https://www.homemadetools.net/forum/...275#post142035
https://www.homemadetools.net/forum/...093#post164941