A cutter head (9) releasably mounted on a tool holder (1) and to be fitted with an exchangeable cutting insert (11a) whilst the tool holder (1) is adapted to be secured to a lathe or the like; a substantially U-shaped bushing (23) being articulatedly mounted in a recess (14) formed in an end of the cutter head (9) so as to define a receiver socket adapted to receive an engaging head (5) of a drawbar (2) longitudinally displaceable within the tool holder (1); the arrangement being such that with the engaging head (5) of the drawbar (2) located in said receiver socket, a traction force exerted on the drawbar (2) results in transverse abutting surfaces of the bushing (23) being displaced into a clamping abutment with corresponding transverse abutment surfaces formed on the tool holder (1).
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