The diamond shield has been damaged and looking for a replacement

You can get a cheap replacement protective screen at a local plastics company. you will have to cut it yourself with a cut-off wheel and dremel. or you can have them cut it for you. the original protective screen is to expensive to worry about at this age of the set. check the yellow pages for a local supplier for plexiglas/clear plastics 1/8" or 3/32" clear its cheap!!! and all you need is a phillips head screwdriver to replace it.after you remove the speaker grill there are 4 screws on the bottom of the screen frame. then you lift the frame straight up and it comes out. inside there are brackets holding the screen in place. be very careful not to damage the screen.