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Sorry, meant to reply before.
When you say it thumps to a stop, could it be a loose commutator section getting hit by the edge of a brush when centrifugal force throws it up like this one?
I know you are clear in your own mind what you mean by "Using my jumper cables directly to the starter lug" however the exact connection you are making is ambiguous to me. Starter lug? Solenoid terminal at the brushes or where the battery cable normally connects?

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Art Benstein near Baltimore
A boiled egg in the morning is hard to beat.
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