I have lots of thread bobbins...most work fine, but 3 of them tend to fray and break 8/0 and finer threads. The ID's of the barrels of these bobbins are pretty small. I'm thinking about being able to polish the inside surface of the barrels to get rid of any burrs that might be in there somewhere. Whatever's snagging the thread isn't at either end of these barrels. Is there any sort of a thread, wire, chenille, etc. that's impregnated with or coated with an abrasive of some sort?

Thanx,
PRM