4mm Rope Pulley

Hi,

I bought a car trailer with a lid on it. If for some reason the lid has to come off, I would need at least 2 more persons to do the job.
So I designed a pulley to detach the lid of the trailer on my own. Since the lid is quite heavy (I estimate it to be 60kg) I needed a lot of mechanical advantage (pulling a rope is more difficul than lifting something up - which is why 60kg could be carried with 2-3 persons, but I needed a 16x advantage to be able to manage the rope.
I learned a lot in