MY guess is that the button on the end of the arm has slipped out of the channel on the bottom of the window. If you can still feel the regulator moving inside the door, then it may just need a new roller and rivet. LINK The original ones are some kind of fabric based material and disintegrate over the many years till all that's left is the rivet, which can slip out of the channel.


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.