Hmmm. From what I remember, I saw something that resembled the scene mentioned in the topic. I will swear on my life that after Leia kisses Luke "for luck", the door behind them goes up slightly. He throws the grappling hook, which misses, and he pulls it back up, and the door slowly goes up again. It's only then that he swings and it catches. I will swear on my life that I saw it, though it might have been in a broadcast version.