Actually, I'm the guy that came up with the 2 Harken triple blocks and here's why. Most older Catalina outhaul's, including mine, were frozen in place. They were like the broken clock --the setting was right for one point of sail and wrong for all others. The same goes for frozen fairlead's, which I used to see all the time. The internal outhaul system looks trick but is a poor design and even if you take the boom apart and manage not to break one or both of the end caps in the process, it will still mess up again.
The original slug that sits in the bolt rope track is another problem. Due to the downward pulling motion of the outhaul it causes the slug to dig into the boom creating a lot of friction. With the system I used the pulling motion is horizontal. Actually, a mate should get rid of the slug. The 2 block system is the poor man's solution.
There's a better method that was developed by a friend of mine, Max Munger, Who's the sec't of the C30 National assoc and who I used to race with at National events. He added a short track at the end of the boom and had Garhauer build him a small car. it works great but you have to cut the sail to make it function.
When I set up the system I didn't think it through and I had a problem during the first test drive. I thought it would be slick if I could adjust the outhaul from the helm so I used a short line coming off the end of the boom. This worked great when I was closehauled but not so great on other points of sail. The solution was to add a turning block to the end of the boom and run the line to the front of the boom. I could have run it back to the cockpit if I had wanted to.
BobS: When you tie 2 lines together it doesn't look very nautical!! Buy a new line.