This vintage Singer Merritt Lock 14U44B serger sewing machine Good working condition The Singer Merrittlock 14U44B is a sewing machine and serger that comes with a foot pedal. It has a durable construction, user-friendly design, and a variety of stitch options. The machine also has an automatic needle threader, adjustable stitch length and width, and adjustable presser foot pressure. It comes with a general-purpose foot, a zipper foot, and a buttonhole foot.