From what I know, clockwise is the correct direction. I've been told that it's best to keep your motor running in the same direction all the time. Some machines perform differently be it clock or counterclockwise, but not all. Did you do the mod yet, or are you considering it? Another member asked me about changing a clipcord machine to rca - I haven't done a mod like that myself on a rotary, but I am pretty sure that some members have. Hopefully someone pipes up soon, as I'd like to know what wires go where also!