After making 21 button holes the bottom thread started getting knotted up. It works ok on scrap piece but won't work on my dress.
I would say that somehow your top thread jumped out of the tension disc. Try rethreading, with the presser foot up, then pull your top thread, it should feed smoothly, now lower the presser foot, it should barely move. Sometimes this seats the thread in the tension discs. Also, make sure that you have right thread and needle combination. And maybe, just to be on the safe side, change your needle, it could have a small burr on it after the 21 buttonholes. Good luck, hope I helped you.
thank you, it works great,
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