Mistakes & fixes

Loose loops hanging off a serged edge, or an edge that curls and puckers, points to the tension dials being out of balance for the thread and fabric. Adjust one dial at a time on a scrap.

Fine, sheer fabric sliding out of alignment or getting pulled into the feed dogs comes from its light weight offering little resistance. Sew between two layers of tissue paper or use a straight-stitch throat plate.