E3D-hotend adaptor from direct- to bowden-extrusion

I ordered the wrong E3D-Hotend. For my Ultimaker i needed one with "bowden extrusion" and I bought "direct extrusion", since it was a bit cheaper and now i had to improvise a way to get my bowden-tube attached to the hotend.
I have designed this adapter for this:
http://www.thingiverse.com/thing:94678
promising hotend mount.

All it does is grip into the grooves on the upper part of the E3D-heatsink and include a nut-trap for an M6-nut, since this has proven to be a very reliable way for