I just replayed that part to be sure of the sequence of tubes.
I find that the most difficult one is the second from right end.
Study it and see if that is the one that is off for you.
Then I did the right end one click at a time until he says it's done.
Have you eavesdrop in room 313 already?
Have you checked the gate in the back alley?
Is it the mouse manipulation that's a bother? If so - use your left hand to hold down the left mouse button and the use your right hand to do the right mouse button. I had to do that because my carpal tunnel acted up on this game.