... rotary large shuttle &bobbin ,could reduce the frequency of changing the bobbin thread,and increase the sewing efficiency.5. It could add or ... changs the parts and accessories to stitch the 1-needle moccasin,the binding operation,etc.6. Suitable for ... stitching all the extra heavy-weight materials,such as the handle of bags,gloves, safety belts,tents,seatings,shoes ...