Assembled MK8 extruder

I recently purchased an assembled MK 8 extruder for my Makerbot Replicator 2. When I tried to install the extruder, the unit was too tall and I had to modify the exiting mount for the side fan that blows air onto the part. It also came with a Thermistor installed, instead of a thermocouple, which is required by the Replicator 2. I replaced the thermistor. With everything assembled and connected then the stepper motor didn't work!. I found out that it was wired different then the Replicator 2. I could have used the cable that came with the MK8, but I would have had to splice the cable since the connector on the Replicator 2 was different. After re-wiring the stepper motor, by swapping two of the wires, the stepper motor worked fine. After all that, the new assembly is up and running and my Replicator 2 is working better than it ever has. It prints every time without uneven extrusions and clogging. I got it working, but on the downside a novice might have problems getting it to work. The quality of the unit is excellent, but installation is a bear.