I just bought a used machine. I had it set up by a professional sewing repair man. It worked perfectly. I sewed on it. Then I had to change the color thread, both upper and bobbin. Now, the upper thread will not get caught by the bobbin hook, therefore, not picking up the bobbin thread. I am pretty certain I have the upper threaded correctly as well as the bobbin case. I have followed every step of the manual and it just won't pick up the bobbin thread.
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