Spindle, Micro Mill, 2MT 

Chris' Tips
Here is a drawing of the 2MT Micro Mill spindle.

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

Item No	Models
124	LittleMachineShop.com 4700 HiTorque Micro Mill
78	Harbor Freight 47158 Central Machinery Micro Mill Clarke CMD10 Metalworker Micro Mill Various X1-US SIEG Micro Mill

Click your model to see the complete parts list.