1956 Cadillac antenna part needed

[carguyblack]

I have a complete antenna I am rebuilding but it appears that my main drive gear is warped as it is binding on the worm gear in an "out of round" manner. I can't seem to rectify it so I was hoping to find a drive gear to replace it and see if that resolves it. I don't need the worm gear off the motor shaft but rather the large gear/nylon cord take up spool portion. Any help out there with this one?
Thanks a lot, Chuck