Anyone Know How this Furler is meant to work?

So my new (to me) trailer sailer came with a large variety of headsails all of which are hank on except the number 4 which I assume is pretty much a storm sail which is in its bag furled and attached to a drum at the bottom and a swivel at the top joined by a wire and again hanks.
I would have assumed that this sail was intended to be mounted behind the forestay except that there is no mount for the drum on the bow apart from that which carries the standard forestay.
The swivel at the top seems even more confusing is it has a metal arm protruding lateraly and no T junction to fit in the mast like the std forestay. Perhaps the ring on the end of the metal arm is intended to connect to a forestay and the swivel simply pulled up on a halliard. If so the problem still remains that the drum has nowhere to mount as there is no mount on the bow separated from the main forestay by enough distance to allow the drum to work.
Anyone got any ideas? Particularly in relation to the top swivel having the arm.

This pic shows the setup...

That furler is sold for small , like <24 feet sail boats. Usually the sail has a wire luff and the head corkscrew is attached to the forestay to ensure the sail does not wrap around the forestay when furling/ unfurling. . My guess is the sail is not intended for your new toy.

Hook it up.
Haul it up and se if it works.
Nothing to lose and it might just be fantastic.
But then again.....

Let us all know, won't you

gary

Thanks for all the help guys.

Put the mast up in the yard now and am running the sails up one by one to decide what I'm going to take to Airlie Beach.
Couldn't see any way to make that furler work properly so took the sail off the furler and will just keep it as a storm jib for when I get caught out in too much wind.

The boat has a crank mechanism for the boom to be a roller furling set up but the two mains I have tried so far both have two reefs apiece and the boom also has internal reefing lines that come out of the front of the boom around a sheave each adjacent a cleat on the underside of the boom. The reefing lines are tiny in diameter.

The mast raising mechanism is brilliant and it involves an A frame bolted to the toe rail behind the mast and an electric winch on the coach house roof. The A-frame terminates in a pivoting double longitudinal roller setup which cradles the mainsail track (which in turn is riveted to the rear of the mast so protrudes). The set up therefore not only provides mechanical advantage to raise the mast but prevents any lateral movement so is truly a single person exercise with no one required to keep the mast from falling sideways until the shrouds can do the job. Of course the shrouds still hang up on one or more of the many cleats and other protuberances about the boat but one can stop the winch a half a dozen times on the way up if required to check for hang ups.

Come a long way from the old gin pole - mind you needs to as it's a very tall mast.