I bought a featherweight on ebay and got it Friday. It sews beautiful but the top thread keeps getting caught in the bobbin case and when I stop the top thread is caught up in the bobbin case. I took off the throat plate and cleaned it out but it still does it. I haven't tried winding a bobbin yet and have just the bobbin provided with thread already on it. Do you think it is the difference in thread? I guess I need to wind a bobbin and try it with the same thread in the top as the bottom. What do you think?