Abstract: A method and apparatus is disclosed for precision adjustment of the suspension of motor vehicles, in which the wheels and axles are suspended with adjustable radius rods. All four wheels of the vehicle are supported by pairs of rollers carried by rotatable bases. The bases supporting the front wheels of the vehicles are mounted for lateral movement. Both the front and the back wheels are supported laterally by means capable of registering the force required to counteract any tendency of the vehicle to creep sideways when the wheel-supporting rollers are driven. Adjustments are first made to correct for any tendency for the vehicle to drift laterally. Measurements are then made at spaced points on the vehicle to determine the angle between its actual longitudinal center line and the ideal. On the basis of these measurements, the wheel track of the vehicle is also centered with respect to the vehicle. The invention enables an optimized adjustment to be achieved with great efficiency.

Abstract: A variable resistor of modular design having a hub-flange and at least one housing frame having a central opening. A spring carrier provided with a contact spring is arranged in the central opening of the housing and is rotatable by means of an actuation shaft. A carrier plate, on which the resistor course and the collector course are mounted, is positioned adjacent the spring carrier such that the contact spring provides an electrical connection between the resistance and the collector courses. The housing frame has a pot-shaped front side for receiving a rotor. Means is provided for arresting rotation of the rotor to within predetermined angular limits, and the rotor has a contoured rim for engaging a click-stop device.