Shifter Knob Edit
The shifter knob on the manual transmission DeLoreans is a standard screw-on type.
The shifter knob can be easily removed and replaced just by unscrewing the old one and screwing on the new one.
johnarleyburns on DMCTalk has posted a tutorial for how to replace the shifter knob a How To: Install Shift Knob for Manual Transmission, complete with pictures of different shifter knobs and the process itself. He uses a pipe wrench with the protection of a a towel to remove the old knob, as well as covering the installation of both universal knobs and those from DeLorean Motor Company.