I found this on another site and it worked for me. RonL
Looking at the brush, remove the two screws from the black plate holding the brush. There are two clips that holds this plate once you remove the screws. This should be easy to remove with a flat type screw driver. Now is the tricky part to remove the top cover of the vacuum so you can access the compartment to put the belt on. The whole top part of this vacuum comes off. If you look above the part where black plate was, there are two more clips on the top left and top right hand corner. These two hold one end of the top cover. It is not as simple as pushing the clip to one end to slide out. You have to find a gap between the edge of top cover and bottom structure(right next to each clip) and shove the flat screw driver in and push the top cover away from the bottom structure and push down the top cover. You will notice that there are invisible hinges between the two which locks in the top cover.
Do the same procedure for the bottom right and left edges(right next to each end of the brush) of the vacuum and separate the two(bottom structure and top cover) out using the flat type screw driver..
RonL, February 2009