i believe that amount of play is correct , but there is a spring that should return the rotor when released, mine was stuck too(89 county) and i just did as the book says and put a drop or two of oil down the center of the shaft and worked it back and forth. it took quite a bit of working and re-oiling to get mine to return .but eventually it did when advance and retract on a smooth spring loaded arch. every tune up that shaft needs a drop or two of oil.
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