Russ L's reference is great - shows the thing in use but I didn't see a clear shot of the thing itself. Try contacting him directly.
This tool is really necessary for setting up a large rig at the dock. I don't think you really need that much umph on a boat under 20 tons. I've been happy using a mallet and a heaving hitch or, as I hesitantly mentioned because it goes against the orthodoxy I was taught, just setting up by hand from the leeward side.
G'luck
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