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Frister and Rossman Cub 3 whirring but not moving?

The motor whizzes, but nothing moves. Looking down from the top I can see that teeth are missing on the large wheel at the end that would connect with the rubber wheel for the bobbin winder. Trouble is that I can't get that end of the casing off. I've undone two screws and unscrewed the plastic drive, but something is still holding it on at the top. Any ideas? Am I just going down the wrong route anyway. Thanks
Caroline W, April 2017
Either the stop motion on the balance wheel is not tight or the washer inside has moved or you are missing some teeth off the drive belt

ken dourof, April 2017
link Click here to see other fixes for Cub 3.