Disconnect the sander from its electrical outlet by unplugging it.
Measure the width of the Porter Cable sanding pad with a ruler
Cut a piece of sandpaper to the same width and to a length of 4 1/8 inches long with scissors or a utility knife. This is approximately 2 inches longer than the length of the sanding pad.
Slide the metal hook provided with the sander into the long slot on the clamp located at one end of the sander. Slide one end of the paper into the sander, stretch the paper over the sanding pad and then attach the other end of the paper to the clamp on the other end of the sanding pad.