Joe,
I want to thank you for the leads. I called American Cushion and they told me that the yellow foam is to be separated from the springs and the gray rubber on the back of the springs. The gray rubber is to remain attached to the springs and new foam is glued to them. They could not tell me if the springs were molded into the gray rubber or was sandwiched between the yellow foam and the gray rubber. I guess the burlap can not be used. I am going to call Legendary and ask them about this problem area.
Bob