Thanks for the advice. The thing is, my arm won't flex back to perpendicular with the windshield. It will only go back a few inches. Unless you have to give it a good tug. In other words, it didn't want to give like the front wipers do. It doesn't take much of a tug to fold back the front wipers perpendicular to get access to the arm, the rear seems like it would take a lot more force and that it wasn't suppose to go that way.
But I suppose I can remove the rubber insert and simply replace with the insert from my new blade. That's probably easier to do with the blade off completely, but I suppose it can be done while installed. Would you agree?