Modular Power:
A single RopeTie gives you a 3X theoretical power leverage.
Note: Our tests show that friction losses at the clam cleat result in a 60% efficiency reducing the effective leverage factor to 1.8
Additional impact on efficiency will depend on the friction losses at the anchoring point - negligible if you use a low friction pulley.

Add a second RopeTie to compound your leverage to effective 3.24X (... and add another one to get 5.8X leverage!) and experience the dramatic reduction of effort required to tighten a rope or pull a heavy load.