An inhauler, sometimes called a Barberhauler, is used to pull the jib sheets inboard from their normal position. You can do that to decrease the sheeting angle or to keep the sheeting angle the same as you let the sheets out to add fullness. We do that when we need more power to drive through the waves. In flat water, we don't use it and the rings just sit on the sheets without load. I actually have twings setup on these sheets and the rings is used by the twings as well. The rings I use are very light so they do not harm the paint on the deck. They are descending ring are from REI and their 5,000 pound rating, typical of climbing equipment, is ideal for my boat. Low friction yacht rings work as well but are more expensive. At one time I used carabiners with wire gates. They will grab stuff. If you are going to use carabiners, use locking ones. Some of the pictures below are older and show carabiners.
This is generation 3 of my inhauler setup. It is easier to use than previous setups because there is a single control point. The 8:1 purchase seems ideal for the job and the fact that one control line works both port and starboard is a great advantage. Once balanced, you are automatically maintain your trim after a tack. I like to rig my double block so the line is against the deck instead of the face. You can see that in the pictures below.
I should note that a jib needs to be cut for an inhauler. Ideally, the clew should be at cabin top height. A higher clew will work but with reduced efficiency.
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