Abstract: A portable support assembly adapted for use with tubular or barrel keys includes a coded adjustable mount for maintaining the key in a predetermined code location. The mount is secured to one face of a cutter support and includes an eccentric cutter opening through which a support assembly is extended for cutter grooves of selected heights around the periphery of the key. In order to control the depth of cut of each groove the support assembly is provided with a threaded end stop bearing index marks which according to the rotation thereof controls the depth of extension of the cutter through this port.