Well i started with two strands according to the "Henk Verhaar" method (You'll find a description searching for that name on the global fly fisher site). Now i just have one continuos thread which i layout in a V-shape and a mechanical twister which twists the 2 butt legs of the V with the same rpms at the same time. Never tried the "double the length of the leader and fold back" method (i don't have the room for that).

Karel