Hayes have never been politically correct on RCU however they have always been the best and it is never neccessary to use a third line. This method provides the most important factor of all when using two stroke engines - a pinch line, try that with a third line ain't gonna happen.

I just cringe when some walks up and wants me to fly their beautiful cowled whiz band and expect me to break it in and tweek it in half a tank with only a hole to stick a long screw driver or something in to adjust the needle and no access for the midrange and worst of all no way in the world to pinch tune.