Instruction Manual
Page 20
... hook lubrication. Improper upper thread tension. Insufficient lubrication to p.7 of the Supplementary instruction manual. Threading Needle groove direction Polish the needle hold in the supplementary instruction manual. Bent or blunt needle. Refer to the rotary hook assembly. Upper thread tension. mentary instruction manual. Needle bar lift stroke and height. Set the needle and rotary hook point...
... hook lubrication. Improper upper thread tension. Insufficient lubrication to p.7 of the Supplementary instruction manual. Threading Needle groove direction Polish the needle hold in the supplementary instruction manual. Bent or blunt needle. Refer to the rotary hook assembly. Upper thread tension. mentary instruction manual. Needle bar lift stroke and height. Set the needle and rotary hook point...