Hello Val,
No you don't need a new foot control, peel back the rubber on the botton, be careful it may be a brittle by now, undo the screw, if you hear a slight crack it will be the plastic breaking slightly from the control but don't worry because you can stick it back in again, open the control and you will what looks like a big fuse going across two terminals, slacken the screws take it out and throw it away, it is only a suppressor and after a time they blow, you don't need it, any problems e-mail me.
ken
drivewithken@blueyonder.co.uk, March 2008