Chốt giữa Spooltenna (Center Pin)

The spooltenna is a portable End Fed Half Wave antenna that is kept on a spool. To unspool it, you typically need to stick a pen in the center and pull.

The problem is that my EDC pen is too thick for the spooltenna, so I decided to 3D print a center pin that permanently affixes to the spool. This print also adds a small grip to hold while winding the spool along with a dimple on the opposite side to press your thumb while unspooling.

The only hardware needed is a single M3 x 10mm screw!

I have also included the FreeCAD files should you wish to modify it to your preference!