Pneumatically-actuated magnets.
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Previously:
https://www.homemadetools.net/forum/...503#post166555
https://www.homemadetools.net/forum/...371#post161819
https://www.homemadetools.net/forum/...4677#post80364
https://www.homemadetools.net/forum/...410#post122179
https://www.homemadetools.net/forum/...197#post134712
