Mark, same sentiment here. That looks like a Hood furler; not a Profurl. The design strongly resembles the Hood furler on my previous Hunter; however, I had the continuous furling line model. @Kraffert photos appear to show an “open“ drum, not a closed drum that was used in the continuous line model.That is not a Profurl. I think it is an old Hood furler. The line shouldn't be wrapped and knotted like that. Cut the knot, remove the line, and it should be obvious how a new line attaches.
Yes, mine was below deck, I raised it for accessHere is an image of the Hood furler. There are striking similarities to the one you show only located below deck as some Hunters were set up.
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Mark nailed it.