SOURCE: Kenmore Sewing maching 158 15510: sewing mechanism
You put the hook (the half moon thing with a sharp point on it) in the machine by placing it opposite the little curved bar. Make sure it is seated properly on the ridge. The you take the race, the circular part with a small plate on the top and place that over the hook(the plate side will be facing up). It will only fit a certain way, it could have a slot that a notch fits into (that is usually how it goes). Then slide the arms over it and they will snap into place. Once done, turn the handwheel and make sure everything moves smoothly. If not, you'll need to start over as something isn't seated correctly. Then you can install the bobbin case as usual.
SOURCE: the bobbin thread is bunching up on the bottom of
the tension it too tight loosen the tension
SOURCE: Kenmore model 158 15510 will not catch the
Feed dogs.
Check the manual for how to engage/raise the feed dogs.
Or, it could be the machine needs cleaning.
Open the bobbin area and the throat plate (plate under the presser foot) and clean with a soft brush or cotton swab.
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