Have used bronze brushes for 50+ yrs.. If one sticks , it's likely too big of diam. for the bore. If one breaks loose from the threaded end all you need is a cork screw jag used to pull shotgun wads. I don't understand all the verbage about stuck brushes. When inserting a brush , never turn the rod to the left as that unscrews the brush from the rod. Cummon guys , basic mechanics here. I have an 83 yr. old neighbor that shoots his flinter frequenty. The only tool in his tool box , is his check book. Finally got him a CO2 ball discharger , that has kept him in business w/o me getting involved , though when he shows up , . it's fun.