Big thanks to the good helpful people on this forum, I finally got the cartridge out and replaced, and the drippy faucet is fixed, total cost $17.00. I don't have a deep 5/8 or 11/16 socket, so I used big vice-grip pliers and a large hammer, tapping backward and forward until she popped free and I could unscrew by hand. Also cleaned up the sink crud with a razor-blade and scrubbing powder and she looks shiny new. I very much appreciate the help!