... 1A 3The device is installed in side Model : DB-JP-15 (adjustable pressure spring type) (1):Use funtion It adopts sliding ... ,uses back pressure piece knob rise functionto help thread sequin. 3.To change sequin specification ,just need to change specially-made steel ... / min ¢ 6.75mm----- ¢ 9mm 800 r / min 4.Specification of sequin: ¢ 3mm, 4mm, ¢ 5mm, ¢ 6.75mm, ¢ 9mm 5. Specifications of stepping ...