How to remove bulb from this Harden faucet to replace cartridge

My widespread Harden faucet has set screw that removes the handle but the white base bulb will not come off. I can turn the bulb but there is a metal rim which extends inside the bulb and prevents it from being pulled up. When I turn the bulb, the metal above the bulb does not turn so somehow I need to get that out. Faucet is leaking and I need to replace the cartridge.