2-13. OPERATING PROCEDURES FOR BUTTON SEWING MACHINE - continued.
r. Through and Through Stitching Metal Shank Buttons - continued.
The button shown in the above figure has a large eyelet and therefore does not
require the use of button holder spring (9).
(8) The function of the button holder spring (9) is to lend added security in holding metal shank buttons
with short eyelets, for through and through stitching; also to compensate for any slight inequalities in
the thickness of the wire of which the button shanks are constructed.