Can anyone help with the threaded chrome part for the base of my '92 240 Estate aerial please. As you can see from the picture, the small threaded section that the mast screws to has broken off the main body. All of the outside part and mount is attached to the cable by a small knurled nut so it can be detached easily from the car without changing the cable. Happy to have all of the outer parts including the mast although my mast appears to be good. Anyone?