Retainer, Z-axis Lower Bearing CLEARANCE

The fit on my X3 mill was spot-on, and it holds the Z-axis bearing firmly with no wobble during cuts. Installation took maybe five minutes, and it feels like a solid upgrade from the original part.

Finally, a retainer that actually grips the lower bearing without loosening during heavy milling cycles. The machined fit on my X3's Z-axis feed screw was precise enough that I didn't need to shim anything. No more worrying about the bearing slipping mid-cut.

Slipped right onto the Z-axis lead screw with no fuss, and the lower bearing hasn’t budged during a full day of milling. The fit is snug enough to give me confidence without needing any extra shimming. Exactly what the X3 mill needed.