My machine will not thread any bobbins.
Your bobbin winder has seized. Remove the top cover and oil the area where the bobbin winder shaft goes through the bobbin winder assembly. You might need to force the winder to turn with your fingers for a while, but it will begin to turn smoothly once the oil gets in there.
If the black bobbin winder tire has a flat spot worn into it, you will need a new bobbin winder tire. Costs around a dollar.
The value of the model 920 new home sewing machine
Search sold listings on eBay. Valuations will depend a great deal on the machine's overall condition and the accessories included.I believe the 920 is a straight-stitch only machine, so it's desirability may not be as high as a machine that can zig-zag. However, supposedly it does make a superior straight stitch.......
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