I have made this modification to 2 speed controllers, one on my drill press and one on my band saw. I just cut the lead on the Q6 transistor collector (looking at the flat face of the transistor, it is the lead on the left), or you can cut the lead on the 5.6K resistor attached to the collector. I left it in place in case I had to go back. Now I can start the motor at whatever speed the pot is set at. Works great. Drawing is attached.