Worm, Z-Axis Fine Feed 

Worm, Z-Axis Fine Feed
Part Number: 2179
Weight: 0.71 lb

Price: $13.35

In stock
Worm, Z-Axis Fine Feed

In your instruction manual, this part appears on the parts list as:

Item No Models
56  Harbor Freight 47158 Central Machinery Micro Mill
Clarke CMD10 Metalworker Micro Mill
Various X1-US SIEG Micro Mill
74 4660 HiTorque Micro Mill 4700 HiTorque Micro Mill
Click your model to see the complete parts list.