I expect you've thrown it by now,but I've just had the reverse problem, cable jammed short. You'll have to remove the "Switch covers", be very careful as there are small Plastic lugs inside for hingeing, I broke mine and had to do a "Chips Mod", underneath these you will find the remaining 2 screws, 1 under each cover. There is another screw in the hole where the cable goes into the machine, ignore it ,as it does'nt hold the base together.
Good Luck!
"Chips", May 2009