That was the hint I needed.  It wouldn't turn by hand, so I used needle nose pliers.  Off to find a replacement...thank you very much for your help!
 
Ellen & Lola, '85 Vanagon ASIDon't wait for a light to appear at the end of the tunnel; stride down there.....and light the bloody thing yourself.' ~Dara Henderson> You should be able to just unscrew the thing directly when the cover's> off... It's a black plug that goes through the blue plastic wiring track.> If it's anything like mine, just playing with it will get it to come on> again for a week or so.> > toodle pip,> --> Dug Smith | Don't accept your dog's> (mailto:dug@dugbert.com) | admiration as proof that> (http://www.dugbert.com) | you are wonderful.> 
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