Abstract: In accordance with the present invention, there is provided a profiler device having a linear drive mechanism with enhanced tool holder support to effectively guide the substantially linear reciprocating movement of the tool holder so to maintain accuracy during machining operations and to extend the life of the tool and the device. The linear drive mechanism includes a reciprocating sleeve guided for substantially linear movement in a main guide sleeve, which is fixed to a profiler housing. The main guide sleeve includes a square socket formed in one end for receiving a square end of the tool holder. The surfaces of the square socket and the square end slidably engage one another for guiding and supporting the tool holder. The square end of the tool holder also includes a central bore which receives with a friction fit one end of reciprocating sleeve for being driven linearly with the reciprocating sleeve.