1982 Corvette rear cargo shade

Hi,
I'm in the process of trying to replace the rear cargo shade in my "82" Corvette. I've got it out of the car and have a new shade ready to install but I can't find any instructions on how to remove the old shade from the spring loaded roller and install the new one. I've looked in the service manuals and the assembly manuals and can't find anything on it. Thanks for the help in advance.
Curt