Sewing machine sped
You should be able to adjust the pedal to go slow enough. I had same problem years ago. The main thing is getting use to pushing the pedal which will come with practice. The easiest way is to put a piece of wood or some type of stop under front of pedal. Push down until you find a speed you are comfortable with and adjust your stop accordingly. When you find the right speed you adjust the rod that goes to clutch arm. The rod should be adjustable up and down and also try it in different holes in clutch arm. Leave the spring alone. These are good motors and should last forever. Hope this helps some.