wormgear singer sewing machine

Singer sewing machines with a horizontal gripper need a two to one revolution gear. If the gripper gets stuck, the smaller wormgear is damaged easily while the larger one remains intact. Likely this is caused by inferior plastic used for the smaller gear. It is quite difficult to remove the axle such that the defect wormgear can be replaced, but it is not impossible. However, be prepared to spend a few hours !