Pen holder for hANDi

This is a Add on for hANDi hand orthos
http://www.thingiverse.com/thing:1064647

It makes the user able to draw even if they cant close their hand.
The hole for the pen is 10mm in diameter and the pen is locked in place with a screw.

its designed for a M4 screw and nut to hold the pen in place and 2 M4 screws to mount it on hANDi.