ELNA Supermatic Service Manual page 10

Turn the cradle spring screw CW until it barely contacts the
cradle. At this point you should hear a slight clicking noise
with the machine running.
This is the cradle hitting the head of the cradle spring screw.
Turn the cradle spring screw CCW 1/4 of a turn at a time until
the clicking stops.
There is a stop screw on the right of the upper casing.
Tighten the stop screw until it bottoms out against the end of
the cradle spring screw.
Close front cover and replace presser foot.
9