2-13. OPERATING PROCEDURES FOR BUTTON SEWING MACHINE - continued.
o. To Change the Button Clamp.
(1) Unscrew thumb screw (1).
(2) Remove hinge pin (2).
(3) Slightly raise pressure bar (5) to relieve pressure on clamp, and remove clamp from machine.
When installing the shank button attachment, the hinge pin can only be placed in
the upper pin holder.
(4) To replace, first inserting hinge pin (2) in either upper or lower pin hole, depending upon whether
two-hole or four-hole button is used. Replace and tighten the thumbscrew (1).
(5) Replace and tighten thumb screw (1).
(6) See instructions "To Adjust for Two-hole and Four-hole Button," paragraph 2-13j.