(under subclass 186) Device including a work-engaging protuberance, concentric with the tool-axis, axially advanced of all cutting edges of the tool and specifically adapted to fit into an existing surface configuration of the work and thereby restrict the tool while in operation to move in a path according to configuration.
SEE OR SEARCH THIS CLASS, SUBCLASS:
82, for similar structure wherein the central-lead pin does not partake of all the motion of the tool during the cutting operation.
201, for a non-adjustable tool including a removable central lead.
209, for a tool having a product receiving chamber and a central lead.
225, for a tool having axially spaced, stepped cutting edges and a central lead.
