CHECK SPRING STROKE AND PRE-
TENSION DIAL
1. Thread the machine up to the thread
guide. Make sure the foot is down. Grab the
thread on the other side of the thread guide
and mark it mentally.
2. Pull the thread and the check spring
will swing down. The thread from where
you marked before to the thread guide
should be about 11- 15mm.
Starting
point
11-15mm
3. To adjust the tension stroke locate
the screw under the beehive tension
unit and loosen it. Swing the tension
unit to obtain the proper stroke.
4. To have the pre tension set correctly,
use the end of the gauge which has a
mark for 4mm. Stick the gauge into the
pre-tension and the gauge should only
go in 4mm line on the QM39401 step
gauge. If not turn the pre-tension knob to
adjust.
60
4mm