It is designed to support the center tool when it is sharpened on the working mandrel.

In the case 1 of the headstock, there is a pinot 2 with a conical hole for exchangeable centers. The rack on the outer surface of the quill is meshed with a gear wheel on the axis of which the handle 5 is mounted. Turning the handle 5 of the pinol 2 with the center 3 moves along its axis, which makes it easy to change the product in operation. The center 3 is pushed out of the quill 2 by the clamping ram 6.

In the process of operation, it is necessary to lubricate the quill with a grease gun 7, installed on the headstock body, once a shift. Replacement centers are available for a fee.