I once tried to crack mine open and figure out why it doesn't work. I gave up.

Later, I had to replace the mast in the Hirschmann antenna in my 944, and the whole time, while struggling, wrestling, and cursing, I couldn't stop thinking about all the other cars out there with integrated antennae in the windshield, little sharkfin antennae, japanese cars with little simple inexpensive antenna motors, or simply fixed antennae...

I'm sorry I can't help. Maybe take it apart again and see if you left something loose. See if you can use someone else's motor as a reference. How does it not work - completely dead, or it runs but doesn't dispense the mast, or what?

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'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo