Hello, I am rigging up my 1985 Hunter 23 for the first time. I cannot figure out how to rig the adjustable (pulley) mechanism for adjustable back stay. I know I have to pull it down to tighten the backstay, but what do I use to pull it down and where would that attach? Also, at the aft end of my boom, there are two lines that run down the starboard and port sides of the boom. What are these for? Your help is much appreciated.