Thanks. I tried taking a honing stone to the aft end of the shuttle, to dull the sharp edge. If I run upper tension too loose, it doesn't seem to break the thread, or at least not so readily. Of course, it leaves big loops on top, tightening the upper tension just to get rid of the looping on top will eventually see the top thread break. Before it breaks, I increased the bobbin tension a bit to try to get rid of bobbin thread appearing on top.
I will pursue a new shuttle. Is there any other brand than Boye I should search for which is liable to be out there?
Last edited by oldsewnsew; 12-16-2013 at 08:02 PM.
Reason: key misspelling