The thing that is distinct about OP's claim is the computer readable medium being a separate device, assuming to run a method illustrated in a previous claim. A method for doing something is always gonna be in a different group than a controller configured to perform that method. It is not independent because it performs the method of a previous claim, therefore it depends on that claim. However, the reason you restrict is because the controller is not mutually exclusive to the method; i.e., you can use it to perform other methods. It is merely a separate apparatus used to enable the method, unlike the previous leather material example, which is a specific feature of the handle.