Mechanical Linkage pen MKI modifications

thingiverse

I didn't have a cap head screw that fit the handle, but looking at the arm I figured if I mirrored it, the screw boss would serve just fine. In tinkercad, I bumped up the boss to 6mm and made it solid - it works like a pro! I've got a box of pens lying around, but none had an ink tube long enough for me. So I lengthened the plunger, but left the hole open-ended. Once I found the best fit, I filled the hole with hot glue to keep the ink tube from sliding in too far. This will also require shortening the spring. Kudos to Blackdynamics for sharing this sweet gadget pen!