ELNA Supermatic Service Manual page 37

Clean and inspect all components noting the sequence of
assembly.
Install the Check Spring over the Lip on the tension disc
bushing.
Carefully reinstall all components one at a time without
damaging the Check Spring.
Insert the Upper Tension Bar through the Upper Tension
Plate.
Assemble the Upper Tension Spring over the Upper Tension
Bar and secure the Eye Bolt with the Locknut or Screw to the
original dimension.
After assembling into the Front Cover, set the Tension
Regulator Dial to "0." There should be minimal play between
the Eye Bolt and Locknut. The Upper Tension Spring should
move side to side slightly but have enough pressure that it
doesn't rattle loosely. Adjust Locknut if needed.
Checking the normal tension
When the upper thread tension is adjusted correctly, no tension of the upper thread should be felt when a No.
120 thread is being used and the Tension Regulator Dial is set at "0" (with the presser foot lever in the down
position). The first slight tension should only then be felt when the indicator mark on the front cover is located
between "½" and "1" on the Tension Regulator Dial.
If tension is felt when the dial is set below "½" adjust as follows:
Adjusting the normal tension
To decrease the initial thread tension, turn the upper Locknut
or Screw slightly counterclockwise until there is no tension
felt.
To increase the initial thread tension, turn the upper Locknut
or Screw slightly clockwise.
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