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Needle clamp attachment screw for walking foot, free motion foot and ruffler for Kenmore super high shank machines where there is no arm to activate the fork (arm) of the attachment, it is necessary for you to use the "B" screw. For Kenmore super high shank with needle clamp screw in front.
This "B" attachment screw does not hold the needle in, it is only an activating screw for the feet that have a fork to activate the foot. The "B" screw will screw into the right side of the needle clamp.