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C W Burfle posted:

Here is a better picture of the odd ball connector. Maybe someone can identify it.

The barrel assembly as two different diameter tubes that slide, and are spring loaded.
The hook shaped piece is attached to the inner tube, so it moves out as the inner tube is pushed in.

I am guessing it is a heavy duty connector designed to support the amperage a large transformer circuit breaker test would generate.

Both leads are red, and are only 12 inches long.

I don't want to mess with the leads too much. They aren't cracked yet, but they are extremely stiff, and probably brittle.

I wonder if this is was a spring loaded tip? Hard to discern construction from picture but would be interested in more detailed picture or drawing.