I had a little time to shorten the 5:1 this weekend. This was my take on it. I'm not exactly sure if this is the correct reeving but it seemed like every other way caused the main to cross. There are a couple things I did differently than what I've seen on other versions. 1. the becket was added to the double block 2. I made a small swivel piece for the double block(I contemplated using the sprung swivel that connects the ratchet block to the double.) 3. I eliminated the sprung swivel from the triple using some thick washers.
The finished product:
The triple: Here you can see the outer bolts get a double thickness washer. What cannot be seen is the inner gets a standard thickness(1/16?) washer. The ratchet adjustment bracket gets a 10-24 washer. Also the set screw that is inserted is cut down so that it doesn't protrude into the sheave sidewall. If you tighten your center bolt and your ratchet sheave starts to catch when it rotates it will catch every 120 degrees of rotation which is where the cast centering pins on the sheave are located and your set screws are too long.
The swivel and double: The swivel is lighter and simpler that using the sprung swivel. I was going to cut the plates down to about 9/16" and cut a center hole through which the pin on the double could pass through but abandoned that idea and made the little bracket. If I were to go a step further I'd cut the main swivel pin shorter and drill a new hole for the shackle pin. The double has enough play in the swivel pin assembly to accommodate a plate in the middle so the becket plates can be used as well as one of the end plates from the double.
