Glass cleaning. I thought I found and collected all the big shards of glass, but I was wrong! Glass and fan didn't get along well, so the notches in the fan collected hair and fur = suction power was reduced. These Kirbys are actually very easy to make and parts are still available! Wow! I took my time installing the new fan and bam! He's like new again! Bonus: New drive spindle increases brush performance; You can even see it on the carpet. Cool! And worth every penny! Installation Tips: Remember that the spindle is reverse-threaded. Left handed. If you wish, use soft sealant around the edges of the faceplate. I don't, just to be honest. And a spindle brace. The metal "pointsโ inwards. The rubber cap is put on with a thicker part on the outside, and the plastic washer is on the outside of the metal. Tools: Torx T20 and T15, 1/4" hard flat head, pickaxe and wrench about 3/8" open end. Or less. Oh yes, and Youtube University.