My Singer 6160 Brilliance Won’t Sew Buttonholes – Ongoing Issue Since Purchase

I purchased a Singer 6160 Brilliance sewing machine in 2023, and despite being under warranty, it has never properly sewn buttonholes. Every time I try, the thread bunches up underneath, making the feature completely unusable. I sent it to the service center, but even after getting it back, the prob...






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