Denon DSN-85 MM Replacement Stylus The Denon DSN-85 MM Stylus is the Replacement for the Cartridge on the DP-300F The DSN-85 is Denon s OEM replacement stylus for the stock cartridge on the DP-300F turntable. The DSN-85 is easy to install, simply slide the front portion of the old cartridge out (following the instructions in the user’s manual) and replace it with this new one. Installation couldn’t be easier and you’ll be back up and running in seconds. Please don’t hesitate to call us with questions or for assistance.