Crushmetric retractable pen.
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Previously:
https://www.homemadetools.net/forum/...383#post138972
https://www.homemadetools.net/forum/...955#post140694
https://www.homemadetools.net/forum/...709#post133111
https://www.homemadetools.net/forum/...518#post122888
https://www.homemadetools.net/forum/...501#post122786