I can no longer get a peice of sandpaper to adhere to the bottom of the tool. It seems that the black plastic pad with the micro"hooks" is worn out. I keep it clean, but you can no longer get sandpaper to stay on the tool when running at any speed. The tool is only 5 months old but gets almost daily use. Can I order a repalcement pad and install it myself? I'm thinking it might be a good idea to have a backup pad handy.