9 Groove Pintuck Foot, VikingCreate delicate tucks in very lightweight fabrics using a Twin Needle. Set your machine to a straight stitch with a length of 1. 5 to 2. 0 for precise, elegant results. How to Use: Attach the Foot Snap on the Pin Tuck Foot and insert a 1. 6 twin needle. Thread both needles as usual. Create Pintucks Sew with the twin needle. The fabric will naturally tunnel into the groove on the underside of the foot, forming delicate tucks as you sew. Guide Each Tuck