Reply to "1972 Timing Pointer"

The open loop thingy on the end of the timing mark was for a sensor used by Ford dealers. It dropped into the hole so they could check ignition timing without a separate light. Later, the factory discontinued degree marks on balancers altogether and only used this device; the original pre-computerized-engine smog laws were designed to make changing ignition timing more difficult for owners. Thank your elected members of Congress for all such mechanical nonsense.