Yeah i actually was in the same boat you were. I tried pulling as hard as possible and i couldn't get the left and right knobs off. I have a pretty strong grip and i had other people try. Whenever i pulled it i thought it was gonna break. I got the one on the left off with my hand, but the one on the right took some strategy. I had to bite it and pull
, yeah i know sounds kinda drastic, but it worked. There was glue in mine, or some sort of residue that made it stay in there, cuz now i can pull them out when i want to.