Kenmore Sears 385.16644 Owner's Manual page 41

Threading the machine (3-thread and 2-
thread)
Using the needle on the right only
(for regular three-thread serging or for narrow
two-thread sq?rging): 3.5 mm width
Turn off the power switch and unplug the machine.
Remove the needle and the thread on the left.
Then tighten the needle clamp screw on the left slightly to
avoid losing the screw.
Using the needle on the left only
(for wide three-thread serging or for regular two-
thread serging): 5.7 mm width
Remove the needle and the thread on the right.
Then tighten the needle clamp screw on the right slightly
to avoid losing the screw.
To chanqe to the other needle in three/two-thread
serging
Loosen both needle clamp screws and remove the
needle. Insert the needle and tighten the screw for the
needle to be used while pushing the needle up as far as it
will go. Then tighten the needle clamp screw on the other
side slightly to prevent the screw from dropping out.
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