Mechanical Linkage pen MKI modifications

I did not have a cap head screw for the handle. Looking at the arm I figured if I mirrored it the screw boss would serve that purpose. In tinkercad I increased the boss to 6mm and made solid. Works like a champ.

I have a box of pens, but none had a long enough ink tube. I elongated the plunger but left the hole long. Once I figured the best fit I filled the hole with hot glue so the ink tube cannot slide in too far. This will also require shortening the spring.

Shout out to Blackdynamics for sharing this very neat gadget pen!