art however this limits rotation of the swivel 10 and risks damaging the wires an improvement is to pass the control wires through the swivel with slip rings an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure also called a rotary electrical joint collector or electric swivel alternatively a transmitter receiver mounted in the cab can transmit all commands from an installed control handle mounted on the right or left joystick as well as any other switches or any controls in the machine 39 s cab a receiver transmitter capable of driving the hydraulic valve stack decodes the signal and controls the valve stack a hydraulic generator that is installed in the return hydraulic line generates power to keep a large capacitor charged this capacitor supplies power to operate the electric control valves and supplies power to the wireless receiver transmitter module a battery may be used instead of a capacitor the battery can be charged as mentioned above or removed each night and charged the conventional way as another alternative instead of manifolding one hydraulic circuit into many with a control valve stack placed below the swivel 10 and then routing electric or wireless controls through or around the swivel the excavator swivel can be modified to add more hydraulic circuits through the swivel allowing the valve stack to be placed above the swivel as a further improvement to the prior art side tool system a vertical slider.