If you will go to the boat information and pull up Hunter, click on 23.5 and then click onto down loads for reference to the owners manual. There is an exploded view of the boom as related to the 19, 23.5 and 26. As a former dealer I use to take the boom if I recall correctly when replacing those lines by inverting or turning upside down with the end of the boom held up by it's end while on a ladder, I fed that line down by gravity. when at the other end, I would grab it either by hand or long nose pliers and then feed it thru the turning block. Once done I would put a temporary knot in it and then run it thru the rear boom block. It has been some time since doing that. The manual has a specific section on the 23.5. I remember the day picking up the first one with my daughter and then on the way home to Virginia, I stopped by to pick up some Beneteau literature when their offices was in Charlotte, NC. and the whole office poured out to see that boat which I allowed them as they were not going in that direction with small boats.