Necchi Supernova Instructions Manual page 81

The fastening screws No. 20195 somehow have become loose.
Too much play between shuttle and shuttle carrier spring will
cause
excessive noise and will influence the timing of the oscillating
shuttle.
It is also advisable to check from time to time, whether the
shuttle
is still timed correctly.
Furthermore, also check whether the point of the shuttle has
been
blunted, or whether those portions of the shuttle over which the
thread
passes, have become rough due to rust or corrosion.
Moreover, it is also essential to check whether the inclined
portion
" P " of the shuttle (" needle guard " - see Fig. 73) has been
damaged
(nicked) by a bent needle.
Should this have happened, it will be necessary to repair this
damaged
portion by smoothing it with fine emery cloth, and polishing it
with
crocus cloth, or on a buffing wheel, afterwards.
Fig. 73
The shuttle will work properly after this correction.
81
Copyright -2004