(under subclass 207) 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 the configuration.
SEE OR SEARCH THIS CLASS, SUBCLASS:
196, for an adjustable tool having a central lead.
201, for a tool having a central lead that is detachable from the tool-support.
225, for a tool having a central lead, but lacking a product receiving chamber.
