i have an old Garrett not sure what model it is the tag on it says 024-79 the coil is on open white one with the words deep seeker all it says on the control panel Garrett electronics VLF/TR discriminator it has 4 knobs and one battery test switch the ground zero knob is bad goes all the way around want to replace it but dint know how many ohms and watts this rheostat is. i also need the owners Manuel for it this is my first Garrett and want to fix and use CAN ANYBODY HELP THANKS!!!!!