Originally Posted by
Tartan
Use a pair of old pantyhose and run it all around inside the bobbin and case. Do the same under and around the plate and along the thread route. If the pantyhose catch anywhere, you will know you have a rough spot. I think the repairmen have a special cloth for polishing out burrs?
If you find a rough spot and need to polish it a bit (emphasis on the BIT), its called emery cloth.