旋鈕，Z軸微進給，迷你銑床

Finally, a knob that fits the 8 mm shaft perfectly without any wobble. The 50 mm diameter gives excellent leverage for those tiny Z-axis adjustments.

The 50 mm OD is just right for a solid grip, and it slipped straight onto the 8 mm shaft with no slop. I’ve been using it for a week of milling and the fine feed adjustment feels noticeably more precise than the stock setup.

The 50 mm diameter gives a much better grip than the original tiny knob, making fine adjustments noticeably smoother. It fits perfectly on the 8 mm shaft with no wobble.