SB-7K Spring Balancer for Newlong Industiral NP-7A spare part for portable Bag Closers

SB-7K Spring Balancer SW-6.5 SB-7K Spring Balancer（equivalent to “MW-6.5”) less payload. With a spring balancer you can hang yout portable sewing machine almos weighless in the air. You can sew more bags and will not have pain in the arm.