Timing the Needle with the Shuttle
at a point one-sixteenth of an inch above the eye
of the needle when the needle is on its upstroke.
When the needle and shuttle are correctly timed,
To time the machine so the needle and
the point of the shuttle on its forward stroke must
shuttle operate properly, you must proceed as
pass across the center of the diameter of the needle
follows: Be sure that the needle is a class 16
Figure 4-14.Rear view of oiling points on model 31-15 sewing machine.
Figure 4-15.Bottom view of oiling points on model 31-15 sewing machine.