Rostock Max Easy Flexible filament upgrade

After many struggles with flexible filament on my Rostock Max Bowden printer, I've come up with the best and easiest solution i've come across.
I found that the filament keeps curling up inside the pneumatic push-fit coupler, which has a 2.4mm inside diameter. Therefore I've designed this easy modification to ensure the inner diameter from extruder all the way to the nozzle is nowhere larger than 2mm.

Follow these steps:
- First order a E3D embedded bowden coupler: http://e3d-online.com/E