I'm trying to help a neighbor replace the electrical guts in his column: the turn signal cam stuff and the mechanism at the end of the signal stalk. We got it to a point where it really seems like this upper plastic shroud should be removable, but it just won't come off. I'm looking for any pointers on what to do next. The upper plastic part is attach to the rest, and all the plastic seems only to be held on by the actuator rods for the ignition and turn signals. Here's a pic.