By 'ramp', do you mean the spring metal flap at the *entrance* to the ramp? Above the two screws holding that area of the ramp down are two rivets - but you'd need to remove the entire ramp entrance assembly and then drill out those rivets in order to remove/replace that spring steel flap.
No need to mess with those rivets if you're just trying to pull the *entire* ramp assembly (entry, wireframe, etc.) otherwise.