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You can hear a harp in action on reruns of the " Beverly Hillbillies". That kind of valve lapping tool had different size suction cup for different size valves. They weren't any better than the ones that had a wood handle you just rubbed between your palms. They were used to lap valves in after the seat and the valve were ground usually with a machine.
Jim
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The second is a mechanical valve lapper. It seated the valves to the head after both surfaces were ground.
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