It goes on the other side. One facing the deck and the felt sticks to the lip if you bought self adhesive. Cut thin strips.Not sure where the felt goes on that plastic cover? But I did buy some: https://www.amazon.com/gp/product/B01MTMXCGC/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
Does it go on the gear side of the pinion or on the other side facing the mower? Thanks!