I'm not sure what your specific question is about top nut "adjustment"? With the coilover assembled off the car, we recommend torquing the top nut while using a strap wrench to hold the shaft in place. Don't put anything metal on the shaft. Do not use the rebound adjuster allen key to hold the shaft in place.
Feel free to give us a call pretty much any time (weekends too) and we can help with the install. We are still working on a nice set of instructions.
- Andy