SINGER 216G - Manual (Page 54)

For gimp buttonholes (Fig. 59) draw the gimp thread
through the opening in the buttonhole foot, which is
provided for this purpose, and under the needle.
Fig. 58 Fig. 59
The gimp thread is then automatically covered by the
thread. The buttonholes with flat edges, which are
described above have the advantage of great durabi­
lity. For the making of a button­
hole with raised edges, as illustrat­
ed in Fig. 60, the upper thread
tension
must be set as tight as
possible — almost to the tearing
point—while
the under thread
tension should be set as loose as
possible. For this purpose the upper
thread must be stronger than the
under thread. Otherwise, proceed
as when sewing flat buttonholes.
Fig. 60
50