Hello Tracy,
If you have the clam type control, peel off the rubber bottom and in the middle of the control there is a screw, undo the screw all the way out and the control will open, take out the capacitor and throw it away, what might happen when you try to undo the screw the plastic around it might break away, don't worry too much because you can glue it back in, if you have the button foot control unscrew all four screw to take it apart, any problems e-mail me.
Ken
drivewithken@blueyonder.co.uk
August 2008