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You are searching for Rotor Arm / Condensor

The Rotor Arm is attached to the top of the distributor shaftwhich is driven by the engine's camshaft and thus synchronized to it. Synchronization to thecamshaft is required as the rotor must turn at exactly half the speed of themain crankshaft in the 4-stroke cycle. Often, the rotor and distributor areattached directly to the end of the one of (or the only) camshaft, at theopposite end to the timing drive belt. This rotor is pressed against a carbon brush on the center terminal of the distributor cap whichconnects to the ignition coil. The rotor is constructed such that the centertab is electrically connected to its outer edge so the current coming in to thecenter post travels through the carbon point to the outer edge of the rotor. Asthe camshaft rotates, the rotor spins and its outer edge passes each of theinternal plug terminals to fire each spark plug in sequence.