I am just getting back into trying to sail my Capri and I am replacing all of the lines. So far everything is going well but I am somewhat confused as to the Jib Halyard. In the middle of the halyard there is a block with a pulley on it. I personally have never used or have seen the Jib used so I don't know what this pulley would be used for. I have watched a couple of Youtube videos but it looks like they simply run the Jib sheets and then hoist the gib using the halyard and tie it off to the mast with no mention of the pulley. What is this block/pulley used for? Does another line tie to it? Thanks.