Bigwave,
Here is how I do it, I place a piece of BLACK electrical tape on the leading edge of one of the blades near the tip(my blades are white). I place the Helli against a neutral background and spin it up to the point it starts to get light on the skids. If the blades are out of track the lack tape makes one blade appear shorter and it is easy to see which one is above the other. Adjust the appropriate link to raise the lower blade or ower the top blade. I usually set my blade pitch on one blade and I mark the root so I know which one it is. I will let that be the master and I will adjust the other to it, this way I keep the pitch range I set. I remove the tape and place it on the tail boom for the next time. You should use about 2 inches of tape so the difference is easy o see. Any way that's how I do it and I've never had a problem.

Mike