Hello, I have a replacement cartridge for my Antique K-169 faucet but I cannot figure out how to get the old cartridge out. The Kohler instructions talk about removing the "bonnet", but I can't figure out which part the "bonnet" is or how to remove it. I have tried turning it counterclockwise, pulling the entire housing off after having removed the top and the handle... neither seems to work. Thanks for any advice.