Hello. Being the poor medical student that I am, I am thinking of constructing my own pseudo aussie style 3:1 jib system. How much load will the blocks see? I am thinking of using the following blocks and attaching them to my pigtail and jib respectively.

Harken 127: Breaking strength 2000lbs, SWL 600lbs



Harken 169: Breaking strength 2000lbs, SWL 300lbs


What do you think? Thanks for your help!

Jeffrey