Turn the vacuum cleaner on its back to install. There are two black clips on either side that need to be lifted. This will release the rotary blade cover. With the black cover removed you can lift the cutting roller from the (now) right side. On the left side, at the other end, there are sprockets that keep the belt light. The belt is easy to put on new roller skates. DO NOT REMOVE THE SCREWS. THERE ARE NO SCREWS IN THIS OPERATION! Dead easy!