Hi, push the sides of the topmost section and it lifts off exposing the screws that open the entire brush. We sell the belt and parts and replacements for this exact brush on this page but sold under the name Hayden https://builtinvacuum.com/parts/hayden-parts.html
. Sears, Panasonic, and others sold this brush for decades under different names. It has never changed except the roller brush look and feel, but the replacement sold online fits right in. If you want to replace the entire vacuum head you'll have to but the exact same one unless you are willing to buy a new hose and tool kits such as Stealth or EdgeLift (this is for those of you who have this brush with a built into the wall central vacuum, we don't have hoses for canisters). Let us know if you have any questions.