Manual transmission ballpoint pen. 11:49 video:
https://www.youtube.com/watch?v=fkbpN-ATtBw
Previously:
https://www.homemadetools.net/forum/...383#post138972
https://www.homemadetools.net/forum/...917#post133656
https://www.homemadetools.net/forum/...955#post140694
https://www.homemadetools.net/forum/...026#post140875
https://www.homemadetools.net/forum/...2179#post75907
