Get a friend. Slide one washer over the pin and let it sit flush against the pin head. Slide the spring over. The little offset end of the washer should seat inside the spring. Place the next washer the same way- offset side seats inside the spring. Now, with your thumb, in-depth and bird fingers compress the spring like a syringe while your friend inserts the retaining pin. Careful not to shot the whole thing across the room.