Singer Sewing Machine Instruction Manual page 20

If it becomes necessary to change the hook
distance you must fi rst make a mark on the hook shaft
to reference where the proper rotation of the race must
be. To provide a reference point, make a mark on the
shaft just to the right of the shuttle race clamp (See fi g.
13). The mark must be aligned with the gap where the
clamp comes together. If the shaft accidentally moves
or rotates, you can realign the mark with the clamp gap.
Because the entire shuttle race can be rotated, this step
must be done while the clamp screw is loose.
When the mark and the clamp are realigned it
allows the entry of the needle in respect to the triangular
cut opening in the retaining ring. In some situations the
rotation may be part of the problem. In order to check
the rotation, remove the hook and bobbin case. Insert
the race cover and clip it into place. Rotate the balance
wheel until the needle enters the shuttle and view from
below to see if the needle is in the center of the triangu-
lar opening. It if is not, adjust the rotation of the shuttle
in the clamp to make the clearance front and back equal.
Make a new mark showing this improved position.
When this adjustment is made, it will remain the same
no matter what size of needle is being used.
Moving the Hook Away from the Needle
At the right of the hook and shuttle cage there is
a cast iron leg followed by the shuttle race clamp. Past
the shaft to the right are two collars. The "left collar"
is the closest to the hook and the "right collar" is the
furthest from the hook (See fi g. 15).
Shuttle Race Rotation
Hook to Needle Distance
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