Necchi Supernova Instructions Manual page 76

When released the check spring must occupy the position as
shown in Fig. 67, namely, when the presser foot is resting on
the needle plate, the vertical distance between the loop of
the check spring " E " and the lever edge of thread guide "
A " must be about 23/64". If this distance is larger or smaller
adjust as follows:
Fig. 67
Open the face plate.
Loosen screw No. 048050 GEB (see Fig. 67) which holds the
tension mechanism to the machine arm.
Turn the whole tension mechanism until the check spring rea-
ches its correct position. In turning the tension mechanism,
take care so as not to displace it sideways.
Fasten the tension mechanism in its new position by tightening
screw No. 048050 GEB firmly.
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