Brush skirt ring
You will need eight half inch (.47") neodymium magnets available at Home Depot
http://www.homedepot.com/p/Master-Magnetics-1-2-in-Neodymium-Rare-Earth-Magnet-Discs-6-per-Pack-07046HD/202526367
You will also need about 12 inches of brush bristles that can be purchased here:
http://www.mcmaster.com/#7900t5/=10uwb4e
You might have to take a little bit off the width of the rubber spine to get the right fit in the ring. Sand paper worked great.