Was the spool/cone perhaps bumping again something when it turned as you were sewing. Perhaps it was the spool the thread is on. Do you have another spool of the same brand to try. Perhaps the 'hole' in the center of the spool is larger than your other spools and it 'thumped' as it turned because it was over sized for the spindle or not centered/off centered in the spool itself. I once had a spool that was off. It ended up being the center hole/opening of the spool was just a little bit oval instead of round like the spindle and it bumped against the spindle as the thread was pulled off.
Last edited by quiltsfor; 02-14-2023 at 12:49 PM.