I run a push lock attaching ORC on mine and it takes up about as much length as the Pat's, they are available from Agri Supply online if you do not have a local dealer.
As too the original poster, I think what you are describing is that the weight of the lift arms is holding down against the pins, which will not allow you to lift the lever.
2 options I see,
1. lift the levers while the implement is still suspended in the air by the 3 point.
2. If you have already set the implement down, and the second lift arm is hanging (which is what makes me think this is the case) then just grab the lift arm and lift a little. There is nothing keeping your lift arms from raising, but the weight of the mechanism holds them down.
Short version, you have the weight of the three point lift hanging against the trip on that second hook, and that will keep you from lifting it.