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Here's another guess: http://www.nsn-now.com/Indexing/ViewDetail.aspx?QString=2590011660611 I google'd 56161SOCN and it's turning up a PTO-driven winch system. Maybe it's possible that it's a PTO shaft for some system, but I'm not sure which?
EDIT: aaaaand I'm certain I'm wrong. That part...
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