adywan said:
The "Lost Cut" still exists in its complete form in the Lucasfilm archives. It was documented in one issue of Star Wars insider a number of years back. It's only in black and white and silent (although the audio track is also probably buried in the vaults somewhere because we see a section of the lost cut in the deleted cantina scene). Containing 30-40% different footage and David West Reynolds was lucky enough to view it in its entirety. If the missing grappling hook scene ever existed then it would have been in the Lost Cut and he would be the person who could once and for all clear this myth up
I've sent him a letter to ask, it can't hurt.