You should not let yourself get all hung-up over this...
Fix the pull cord firmly to one side of the pole just above and to the rear of a pulley wheel near the top of the pole. Take the cord down to the hub and feed it through the hub pulley and back up the pole to the top pulley.
Bring the cord down and pass it through the pin and go back up the other side of the pole in the reverse direction - top pulley, down to hub pulley and back up again. The cord will straddle a rib.
When the free-end of the cord is firmly fastened to the top of the post on the other, second side you may then centralise the pin and clamp the cord together so the pin remains central on the pull cord.
You should find, if you have corded it correctly, that to raise the hub by one foot you have to pull down two feet of cord - a mechanical advantage that means you need less force for raising the unbrella's weight.
Good luck...
Peccavi
July 2009