by GreenLake » Fri Sep 09, 2016 2:59 pm
OK, it looks clearly like your setup has the furled headsail in addition to a forestay. So, the forestay would go in the most forward hole and the furler in the aftmost hole on the stemhead fitting (to give you the maximal clearance between the stay and the furled sail).
The advantage of having the stay in addition to the furler is that you can take the sail down all the way without dropping the mast. Good if you keep the boat on a mooring. And makes it possible to set basic rig tension without using the jib halyard (to get enough tension otherwise requires a 2:1 purchase as part of the jib halyard setup). Downside is that the stay can interfere with furling, but, if your P.O used the boat that way, presumably that wasn't a concern.
Your detail photo shows a swivel with a direction "up". The "up" part would be connected to your jib halyard, which is lead through the block on the mast right below the forestay and then down along the mast to be cleated at the bottom.
The other end of your sail would get connected to the furler drum.
~ green ~ lake ~ ~