Last night I was working on a Featherweight with tension issues. I thought some might find is useful to have a list of things to check when working on tension issues:
1) Check to make sure the machine is properly threaded
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detailed pictures here:
http://www.april1930s.com/html/how_t...r_feather.html
2) Flat side of needle should be facing left if you are sitting in front of the machine
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3) Thread should go in through the right side of the needle
4) Make sure bobbin case is properly threaded
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5) The position finger on the bobbin case is the notch of the throat plate
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6) Make sure bobbin case tension is not too loose or too tight
more info here:
http://www.archaicarcane.com/tear-it...e-maintenance/
7) Make sure upper tension knob is correctly assembled
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more info here on tension assembly:
http://www.april1930s.com/html/tensi...er_sewing.html
8) Check for thread nest behind the bobbin carrier
more info here:
http://mysewingmachineobsession.blog...bbin-case.html
I resolved my tension issues by tightening the tension on the bobbin case, so I stopped hunting for tension causing issues. Please list other causes of tension issues (and their solutions).