Abstract: A head unit for a stop holder for a drilling machine for purposes of compensating for a height displacement between two adjacent components during the introduction and/or machining of a component hole. The stop holder has a front rest section for purposes of resting on the components. The rest section has an axial projection, which forms a second contact surface displaced relative to a first contact surface in the axial direction, i.e., the tool longitudinal direction. Also disclosed is a stop holder, and a method for compensating for a height displacement between two adjacent components during the introduction and/or machining of a component hole.

Abstract: A drilling-out aid device for assisting in drilling out a rivet, in particular a blind rivet, by a drilling tool, includes a proximal handle portion for handling the drilling-out aid device; a guide device for centrically guiding a drilling shaft of the drilling tool; a distal rivet-head receiving device for centrically orientating the drilling-out aid device on the head of the rivet to be drilled out; and a rivet-head pressing device, which is mounted displaceably in the longitudinal direction of the drilling-out aid device relative to the rivet-head receiving device to apply a centric gripping force to the head of the rivet to be drilled out.

Abstract: A head unit for a stop holder for a drilling machine for purposes of compensating for a height displacement between two adjacent components during the introduction and/or machining of a component hole. The stop holder has a front rest section for purposes of resting on the components. The rest section has an axial projection, which forms a second contact surface displaced relative to a first contact surface in the axial direction, i.e., the tool longitudinal direction. Also disclosed is a stop holder, and a method for compensating for a height displacement between two adjacent components during the introduction and/or machining of a component hole.