Janome QMP16SU Manual page 23

Five Checks When Replacing the Take-up Spring:
1. With the take up spring inside the barrel, reinstall the center split bolt.
2. Rotate the center split bolt clockwise to make the spring stronger or counter clockwise to make the
spring weaker. To test: the spring should return all the way to the right end of the slot, regardless of
how lightly it is moved to the left. The spring should be just strong enough to always return clockwise
to the end of the slot.
 IMPORTANT: The strength of the spring is critical. If it is too weak or too strong, it will not take up
the thread properly and this will cause stitching issues.
3. With the spring strength set properly, ensure the center split bolt is pushed firmly all the way into the
barrel and tighten the barrel set screw onto the center split bolt.
4. Make sure the top tension assembly is pushed all the way into the shoulder on the front cover.
5. Rotate the entire tension assembly to set the straight part of the take-up spring up toward 12 o'clock
when it is in its rest position, and then tighten the front cover set screw onto the tension assembly.
Check #4
Check that the top tension knob is not too loose on the split bolt and that it has some resistance so that it
does not vibrate loose while sewing.
Adjust if necessary
1. Remove the knob, detent washer and cone spring,
2. Adjust the split bolt by spreading with a flat screwdriver until the knob has adequate resistance to keep its
setting.
U CAUTION: The split bolt is hardened and it may break if adjusted too much. If it breaks, replace the
top tension assembly (part number QM10199).
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QMP16SU Service Manual