The back side of the steering wheel's card board box is shown in the figure. The plywood piece reinforces the pivot rod coming out from the inside. The plywood piece if firmly glued to the box's surface. A knob with a cylindrical projection is attached to the end of the pivot rod. Two screws are attached at both the ends as shown. One or two rubber bands need to be stretched between these screws. Using a hot metal blade, make a vertical cut on the plastic knob. The slit thus made can be used to hold the rubber band. Hence when the knob rotates along with the steering (since they are connected), the rubber band gives an opposing force that brings the steering ( gaming / racing wheel ) back to the center position when the steering is released.
There are two pairs of wires coming from the steering unit - the horn wire and the POT wire. These wires can be twisted together and let through a small hole at the back of the card board box. Note down the colour of the wires and where it's purpose, so that we can avoid confusion while interconnecting the units.
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