Day: January 26, 2016

Click. Click. The two clicks that you hear when pressing the top button on a retractable ballpoint ‘click pen’ are a key to understanding the mechanics happening inside of it: A rotation, extension, and lock of the spring-loaded ink cartridge, pushing the ballpoint tip into place outside of the casing. The two clicks that follow, the sound of pressing…… Continue reading How a Retractable Ballpoint Pen Works – Bill Hammack