ELNA Supermatic Service Manual page 15

Installing the Upper and Lower Ring Guards
Turn the flywheel until the Thread Release is in its highest
position.
This will position the opening in the shuttle hook towards the
rear of the machine.
Insert the Lower Guard Ring through the opening in the
shuttle hook.
Turn the Lower Guard Ring inside the shuttle hook until it is
oriented as shown.
Insert the Upper Guard Ring into the shuttle hook, making
sure that the Shuttle Beak's right stop comes to lie in the
opening of the Thread Release.
Insert an empty Bobbin, in order to center the Lower Guard
Ring.
Open the front cover for an unobstructed view.
While looking through the Screw Hole at the left of the Upper
Guard Ring, slowly turn the flywheel until the threaded screw
hole on the Lower Guard Ring is in line with the screw hole in
the Upper Guard Ring.
Screw one of the two Guard Ring Screws with Spring into the
screw hole a few turns.
Insert the other Guard Ring Screws with Spring into the other
hole and tighten both screws.
Check: It must be possible to press the two Guard Ring
Screws downwards without their jamming.
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