I bought a used RTS400 sander (not certain because the label is long gone) several years ago and have no idea how to replace the foam-backed velcro sander pad. This not like my Ryobi which has the velcro/foam pad attached to a plastic plate that screws to the sander. I bought Festool replacement pads but they do not have a plastic backing and there is no adhesive included to glue or instructions or pictures in the manual or online re: how to attach the pad to the unit. I have a plastic frame that the old velcro/foam pad was glued to and I would be shocked to think that festool would design replacement pads to require owners to scrape off glue from a flimsy old pad assembly and glue the new ones to it. Any suggestions other than buy a new sander would be most appreciated 
