Electrical problem
1989 Mercedes Benz 560sl V8 Two Wheel Drive Automatic 108037 miles

I have to replace the rubber power antenna grommet on this vehicle. It doesn't just slide on, I believe you have to remove the antenna mast, install the grommet, then replace the mast. Anyone can advise on how to remove antenna mast to install this $2.65 piece of rubber?

Thanks