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Check all wire pulleys.
Pulleys must turn freely.
Check for proper wire threading.
Make sure all of knockout disk is removed from front of wire
carton.
Check for any indication where wire has been catching.
Check front of needle for grooves or buildup of foreign material
retarding wire flow.
Check for rough or uneven wire.
Check top wire guide for grooves deep enough to cause wire to
wedge.
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