Thread keeps catches in mechanism around bobbin casing on my 301a
My 301a machine was working fine for the 3 weeks that I have had it. Even filled up the bobbin a couple times. The third time in filling up the bobbin, I started getting a problem. First I was having a problem with the bobbin not staying in the bobbin mechanism. (Found out it was too full). Then I found it was threaded wrong caused by the thread whiplashing. So now I have the thread getting stuck in the bobbin mechanism every time. What is going on?