4-49. BUTTON SEWING MACHINE MAINTENANCE ADJUSTMENT PROCEDURES - continued .
To set needle bar at correct height.
Take out the two face plate screws (1) and remove the face plate (2). Insert needle (3) of correct
size in the needle bar (4), making sure that it is up into the needle bar (4) as far as it will go.
Turn machine hand wheel, by hand, to bring the needle bar (4) to its highest position. Loosen
clamping screw (5) which fastens needle bar connecting link hinge stud (6) to the needle bar;
then, while the needle bar is still at the highest point of its stroke, move needle bar up or down to
bring the top of the needle eye 1-5/16 inch above the top surface of the needle plate. To check
this adjustment, see that the needle point does not protrude through the needle hole in the looper
when the needle bar is at the bottom of its stroke. This check can be made only after the looper
is adjusted and timed as instructed in paragraph 4-49h.