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Hm, I see your concerns. There are some remixes using 1/8 pipe thread, e.g. http://www.thingiverse.com/thing:835542 or http://www.thingiverse.com/thing:676687. The design is easy to customize, so please feel free to change it for your type of fitting if you don't have a common 5mm OD push fitting.
Did you use a second hexnut on the idler screw to adjust the pressure? I never had any issues with a stalling motor so far. Maybe your stepper driver current is adjusted too low?

Compact Bowden Extruder 4mm
compact bowden extruder using jhead normal push-fit