(3) The Metalock key is a special molded part made of a special alloy, whose size and length are fitted to the corres- ponding crack.
(4) The holes are linked using a pneumatic chipping hammer and fitted to the shape of the Metalock key.
(5) Individual layers of keys are inserted into the openings and caulked into an interlocking form, which is practically integ- rated into the base metal.