Thread Tension Spring 13710 Beehive Thread Tension Spring Universal Part No. 13710 This is the spring that tensions the cotton going though the tension unit on the majority of plain sewer industrial sewing machines. Trojan Sewing Machines Supply Equivalent Single Needle Lockstitch Machines. Model Jack A4, Jack JK-9100BS-7 and Jack JK-609C. All with modern designs and the latest technology. All competitively priced.
