So far,no luck in searching the forum for my problem. I bought a Hirschmann antenna motor to replace the original in my '90 300E sedan. PROBLEM: I can't remove the screw-on nut near the top of the mast(so i can push the antenna up,through the grommet,from inside the trunk).The small rounded cap at the very tip of the mast prevents the removal of that nut. Do you have to remove the mast and wire in order to do the install?? Totally lost! Thanks for any help!!

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2001 E320 4matic, 2003 E320 4matic wagon