The tension control complete assembly includes tension control check spring. APQS machines come with the industrial-grade, disc-type tensioner. These types of tensioners are capable of handling virtually any kind of thread, including delicate, decorative and variegated threads with no worry about stretching, stressing or breaking the thread. Simple to install and adjust. (EZQ owners require a different tension control assembly from the one pictured. Contact APQS to order.) This part fits all generation models.