Hey Ted, Is your motor a DC motor ? or a split capacitor AC ?
I was told unless you have a 3 phase AC motor it will not speed control well, This motor you have to turn it up to 7 before it kicks on then you can turn it down to 3 before it starts to slow but then a 1/8 turn more and it shuts off, I also just found out that the safety ceramic covers that were forgot to be put on, that if you were to touch the two prongs it would ( KILL ) you, it is worse then a laundry dryer, and the only thing that was a cover for these wires was a home made very, very, very thin tin box that was made out of 3 pieces that did not even seal up, a sqaure box on a round pan, ( very chintsy ) and deadly game. and to boot the wires were not even crimped down, Some people can say I am wrong to post about this pot but Man you just played with my life and that is not cool.
I tracked down all the parts to make this thing so I will post my set-up after it is done.
A few of the parts will be a few weeks on order.