How do you get on the darn ledge? (mild spoilers)

[Murdock]

There's a "secret" ledge on Nar Shaddaa, right before you jump in the garbage cart. It's above that electrified water, where the droid is working.

 

Now, it seems to me you are supposed to jump on the droid's head to bounce up to that ledge, but I just can't seem to pull it off.

 

Has anyone gotten up there, and is that how you did it? I'd hate to waste my time if there's another solution.