Troubleshooting your bobbin case with Master Technician, Mr. Dennis. Lions, tigers, and burs - oh, my! Burs are rough spots that can appear on your bobbin case and needle plate after making contact with a misaligned needle. If you keep having issues while sewing and you've tried all the basic steps of troubleshooting, check your sewing machine's hook system for rough spots and sand any down with FINE sandpaper! #sewing #bobbin #sewingmachine #sewingmachinerepair #sewingtroubleshooting #bobbincas