Re: I keep breaking thread!
Is your bobbin all metal? If so there could be a bur at the end. Try a little bit of emory paper to sand off the bur. (Or worse there is a bur in the tube. I don't know any way to get rid of those. Or you could buy a ceramic bobbin. Those don't get burs.
If you opt to get the ceramic bobbin and your still breaking thread, your probably pulling to hard.