Hello Essence,
Have you made sure the stop motion wheel is tight ?
Can you hear a buzzing from the motor when you put your foot on the foot control ?
If you can hear a buzzing the chances are there is thread still stuck round the raceway, yopu need to take the bobbin case out and have a good look, with the bobbin case out the machine should move, if it does not and the motor is buzzing then you have a problem.
drivewithken
April 2010