A system for positioning a tool within a wellbore, the system comprising: a first plurality of grooves disposed within an interior of a tubular string disposed within the wellbore, wherein the first plurality of grooves defines a first selected profile; a tool to be positioned within a wellbore, said tool comprising a torch , a cutter, or a perforating device; a blade in communication with the tool, wherein the blade comprises a first plurality of protruding members , and wherein the first plurality of protruding members define a first complementary profile configured to lock only within the first selected profile; an additional plurality of grooves disposed within the interior of the tubular string, wherein said additional plurality of grooves defines an additional profile; and a biasing member in communication with the blade, wherein the biasing member continually biases the blade toward the interior of the tubular string to cause locking of the first complementary profile within the first selected profile; and wherein the blade is an interchangeable blade, being interchangeable with an additional blade that has a profile complementary to said additional profile; and wherein the first selected profile is defined by a first selected spacing of the first plurality of grooves, wherein said spacing acts to differentiate the first selected profile from said additional profile within the tubular string; wherein, the system further comprises: a collar configured for direct attachment to an external surface of the tool; and a hinged arm , wherein the blade and the collar each comprise a single point of connection with the hinged arm. a first plurality of grooves disposed within an interior of a tubular string disposed within the wellbore, wherein the first plurality of grooves defines a first selected profile; a tool to be positioned within a wellbore, said tool comprising a torch , a cutter, or a perforating device; a blade in communication with the tool, wherein the blade comprises a first plurality of protruding members , and wherein the first plurality of protruding members define a first complementary profile configured to lock only within the first selected profile; an additional plurality of grooves disposed within the interior of the tubular string, wherein said additional plurality of grooves defines an additional profile; and a biasing member in communication with the blade, wherein the biasing member continually biases the blade toward the interior of the tubular string to cause locking of the first complementary profile within the first selected profile; and wherein the blade is an interchangeable blade, being interchangeable with an additional blade that has a profile complementary to said additional profile; and wherein the first selected profile is defined by a first selected spacing of the first plurality of grooves, wherein said spacing acts to differentiate the first selected profile from said additional profile within the tubular string; wherein, the system further comprises: a collar configured for direct attachment to an external surface of the tool; and a hinged arm , wherein the blade and the collar each comprise a single point of connection with the hinged arm. a collar configured for direct attachment to an external surface of the tool; and a hinged arm , wherein the blade and the collar each comprise a single point of connection with the hinged arm. <EOS>