K8200 / 3DRAG X-Axis GT2 Belt Modification

UPDATE: I made a better X-axis idler pulley mounting - see here:http://www.thingiverse.com/thing:253357

This ist the first part of improvements i made on my K8200 from Velleman. The standard X Axis idler pulley achived by a ordinary bearing was removed and replaced by a toothed pulley. Additional i decide to change the T5 belt to a precise GT2 belt system.
By virtue of this modifications i had the need for a new device holder.

I have two different version provided. One explicite for GT2