I believe something like this would work.
http://www.youtube.com/watch?v=OSu8PtShiyo
FICAT10N
Now this video is understandable.
Sorry, you have 2 problems.
1. how is the rope/cable going to tighten? This is not certan in your simulation
2. When a weight has 2 separate points of contact, the weight will react where it is located not at the fulcrum.