Firmly secure the feed dog cover plate to the bed of your sewing machine with the bed screw after making certain there is adequate room for the needle.

Raise the needle up to its highest position.

Bring your Singer buttonhole attachment in from the back of your sewing machine. Place its fork on the far right of the needle bar screw where it is the most narrow.

Tilt the top of your Singer buttonholer attachment to the right to mount it to the presser bar (angling makes this easier). Apply and tighten the mounting screw. Make sure your buttonholer is firmly secured.

Your vintage Singer Buttonhole Attachment is fully ADJUSTABLE. This gives you more stitching choices, a greater range, finer control and a more custom buttonhole. The later vintage Singer buttonholers (in various colored plastic cases) use templates to determine the length of the buttonhole.

On this buttonhole attachment, you can adjust the...
1. Length
 ADJUSTING the length means, you can stitch buttonholes from 3/8th inch to 1 inch long. If you want a longer buttonhole, the instruction manual will guide you.

Adjust the length of the buttonhole by releasing the smaller red knob at the back of the attachment (far left in the first photo). A wing nut is used to illustrate this adjustment in the 2^nd and 3^rd photos.

For shorter buttonholes raise the smaller wing nut/red knob. For longer buttonholes lower the smaller red knob/wing nut and secure it firmly.

 You can place the red knob/wing nut anywhere for varied lengths between 3/8th inch and 1 inch. Tighten the smaller red knob/wing nut when you have the position you want.

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2. Space the Stitches

This special and valuable feature was omitted in vintage Singer buttonholers made after this model.
Spacing the stitches means you can ADJUST the distance between the stitches (remember... the feed dog cover plate disengages the machine stitch length/space regulator).

Adjust the stitch spacing using a screwdriver to move this pointer pictured below.

To increase the space, turn the pointer toward the L (Larger). 

For shorter space turn the pointer toward S (Smaller).

The stitch space adjustment can be made
anywhere between L and S. 

ADJUSTING the stitch spacing means you can adapt to the thinness or thickness of the material you are stitching a buttonhole on. From chiffon to heavy wool AND adapt to the type of thread used to stitch the buttonhole. From fine silk to top stitching buttonhole twist.

3. Cutting Space
This is the space between the two columns of stitching which is cut open to accommodate a button. You cannot adjust the cutting space with the later model vintage Singer buttonholers.

ADJUST the cutting space by releasing this red knob/wing nut pictured below and tightening it firmly in its new position. To the right towards N for narrow. 

To the left towards W for wider cutting space.

NOTE: If you change from size to different size buttonhole, thin to thicker thread and fabric to different weight fabric, you may have to ADJUST the cutting space again.

Too little cutting space and the center cut will cut the buttonhole threads (See top left red buttonhole pictured below).
Cutting space that is too wide (see top right red buttonhole pictured below) and the center cut fabric edges will become ragged.

4. BIGHT

This is the width of the zigzag or side to side stitch in the two long columns.

ADJUST the BIGHT by releasing and moving this red knob/wing nut pictured below.

Right towards N for a narrow BIGHT. 

Left towards W for a wider BIGHT.

 
Being able to ADJUST the BIGHT is an advantage when sewing on loosely or tightly woven fabrics or thick or thin fabrics.

Your Singer Buttonhole Attachment can be adjusted while it is secured to your sewing machine. At first, you might find it easier to take it off and re-attach it to see what you are doing more clearly.

Hopefully, you are no longer intimidated by this beautifully complex buttonhole making instrument. Maybe you are nodding your head having experienced this wonderful Singer device.
If you are not familiar with this type of Singer Buttonhole Attachment be prepared to play and learn with practice fabrics. 

Pictured below (center) is a common learning goof.
This column of stitches was created by over adjusting the Spacing, the Width and the BIGHT. The stitches went up and down a single column. Nothing else.

Always start every buttonhole with the feeding foot in the farthest forward position. (Farthest forward or back is where the bar tack is created).

Move the feeding foot forward by rotating this large red knob/wing nut clockwise (seen on the right in the photo). It will turn easily. If you miss the most forward position, just continue to rotate until it comes back to where you want it.

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 There you have it!

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Your Singer Buttonhole Attachment is ready to use! 

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