S420/140 Body Antenna Mast Replacement? HELP!

[OneBadViper]

Hi!

I have a 96' S420 and have replaced many antenna masts. This one is giving me trouble. I guess there is some of the cord still wrapped in the motor. Under the normal, I just roll it in like with no problem. It will not take the cord and reel it in as usual. Yes, the motor runs fine. I guess I need to take the unit apart and get the remaining cord out of the motor. My question is, how do you remove the cover to get to the remaining cord? It will rotate (the cover) but will not come off. It looks as if it can all be done w/o removing the entire antenna. Can anyone help me with this???

Thanks!