Originally Posted by
rogerstg
But have you discovered why the allen screw is there? It's not likely that it's a decoration. FWIW, it looks like the assembly where the cable enters may slide away from the twister; off the key-way shown in the first picture.
I've loosened both allen screws trying to take it apart. I know the one held it to the handlebar. Maybe I need to take the other one completely out to disassemble it. I'm planning to work on it this afternoon, so maybe I'll try that first. Although with where I'm at, swapping out the derailleur will be easier, and the replacement parts are in better condition.