This is a well written and very informative tutorial. Thank you for your time and effort. However, I am finding it difficult to locate a new rotary brush for my Shark Rocket model HV301. At best, I’ve been told that the rotary brushes available ‘May fit’ my vacuum. Hardly a resounding voice of confidence when ordering a replacement part. Does anyone know the part number or ordering information regarding the Shark Rocket model HV301 rotary brush? Thank you for your time.