SINGER 404K - Manual (Page 47)

The Tuck Guide, which is adjustable and may be set for any desired width
of tuck.
The Tuck Scale, containing figures which indicate different widths of tucks.
The tuck scale also acts as a smoothing blade, keeping the tucks of
uniform width.
The Tuck Guide Adjusting Screw, by means of which the tuck guide may
be set at any point on the tuck scale.
The Spacing Scale, contains figures on the upper blade which indicate the
width of the space between tucks. The middle or grooved blade
contains a groove into which the material is pressed by the spur at the
end of the lower or spur blade, thus marking the goods for the folding
of the next tuck.
The Spacing Scale Adjusting Screw, by means of which the space scale
may be set at any desired point.
The Marking Lever, which presses on the grooved blade, marks the material
as it passes between the grooved and spur blades.
A careful study of the Tucker parts, and their relation to each other,
before using this attachment, will make its operations quite clear.
To Attach the Tucker to the Machine.
Raise the needle bar to the highest point, remove the presser foot from
the machine and attach the Tucker in its place. Care should be taken to see
that the Tucker is securely fastened to the presser bar and that the needle
goes through the centre of the needle hole. Note the position of the marking
lever, making sure that it is in the lower position and that the needle clamp
works on it as the machine sews.
How to Adjust the Scales on the Tucker.
The width of the tucks and the space between them is determined by the
adjustment of the scales. Adjustment for width of tuck is made by loosening
the tuck guide adjusting screw, which allows you to move the tuck guide to
the desired figure on the tuck scale. The tuck guide should be set just over
the figure you wish to use. The adjusting screw should always be well
tightened.
The figures on the tuck scale indicate the width of tuck in eighths of an
inch, the marks between figures are sixteenths.
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