[Perfectlap]

^just the knob.

I searched this forum and other Porsche forums and people were coming up with all kinds of methods to pull off the knob using vise grips, pliers, screw drivers, beach towels, boyscout troops, monkey wrench, etc.
You just need leverage, like Archimedes said...

I will post pics, it was too dark. These shifters are nice but dang are they expensive.