So I bought my B5 with a middle A/C drivers side vent that didnt work...so I popped out the vent with butter knifes and i had to remove the side controllers on each side. I noticed that the small black notch had broken off and the toothed gear was just floating around. I was able to take a drill and drill a small hole where the notch was before....however I had to flatten it out a bit. Then I had some loose plastic laying around and was able to make a make shift notch...little crazy glue and i was done. Worked like a charm, so far.