Bobbin use directions: Wind bobbin as usual. Use a fine thread such as MonoPoly or The Bottom Line in the needle. Shorten stitch length. Needle use directions: Use a Topstitch 100/16 needle. Loosen upper tension until stitch is even. Avoid last thread guide before needle. Shorten stitch length. Fusing directions: Use hottest iron temperature setting suitable for fabric being fused. Apply iron for 10 seconds. Allow fabric to cool before handling.