SINGER W1810 - Manual (Page 24)

(2) Determine length
Measure diameter and thickness of button
and add 0.3cm (1/8") for bar tacks.
Mark buttonhole size on material.
marking
(3) Determine width
Determine width according to diameter of
button, its thickness, and kind of material.
Completely push back sliding part @ of
buttonhole foot.
Place material under foot so that marking of
buttonhole passes through center of foot and
arrow (b, of foot indicates beginning line of
marking.
(4) Buttonhole sewing
Bar tacking: Set pattern selection dial to 1 (Qi
and sew 5-6 stitches.