Radio Antenna

[FULLPWR]

my antenna has been missing since i got the Z.
its just empty when you look down the hole.
I have the replacement mast kit and it says to remove the nut first, but all i see is the black rubber grummet no nut anywhere in there.
Ive tried to remove the grummet but cant seem to get it to come out.
the manual shows pics of it but not pics of the nut im supposed to remove first. i tried sticking the base of the new mast and it seems to want to just pop in, so i think the old mast and fitting is gone, i did try to stick the mast cord with gears on it, turned on the radio, stuck it in and turned off the raido, it runs but doesnt grab the geared cord to take it in. im thinking i may need to take the antenna motor out completely maybe dirt and water stuff has gotten in there for sure. really dont want to drive around with the antenna poking way out either.

how do you remove that grummet?
or what are other antenna options have you guys seen or done , so i can just plug the hole?

thanks
Luis