SINGER W7013 - Manual (Page 21)

21
UPPer Thead
Breaking
Material
Puckering
Probable Cause
Improperly threaded
Too much tension
Starting take-up in
incorrect position
Improper setting of
needle
Bent or eye of needle
too sharp
Bent or blunt needle
Tension too tight
Dull needle
Stitch length too
long
Loosen tension on upper thread by turning
thread tension knob to lower number.
Always start sewing with take-up lever in
highest position.
Refer to needle setting instruction see page
No. 8.
Try a new needle.
Discard all blunt or bent needle and raplace
with new.
See tension adjustment, page No. 12.
Change needle.
Reduce stitch length.