The Kirby has a hidden screw in the back for the fan case. You have to remove the motor cover to access it.
Make sure the brush bristles are sticking out of the nozzle far enough. The HEADS of the brush adjusting screws on either side of the brush must face the carpet. If they face up into the nozzle, the brush won't reach the carpet. The brush should stick out one quarter inch beyond the soleplate to clean the rug.
