FIELD: mechanical engineering. SUBSTANCE: one brings slot of cap 3 in coincidence with chosen passage wherein guard pin 2 is received. Locking unit 7 is then turned to the open position so that to bring slot 8 of locking unit 7 and slot made in cap 3 are into coincidence. Next, one moves guard pin 2 away from the passage made in the cap. If head of guard pin 2 leaves the passage, guard pin 2 will slide along the coincident slots. The head of guard pin 2 is inserted into the chuck. Locking unit 7 is rotated so that hexahedral surfaces of the bushing mounted inside the locking unit 7, rotate by 90 deg with respect to corresponding side surfaces of head of guard pin 2. This prevents the head against moving away from the chuck. EFFECT: enhanced reliability. 11 cl, 10 dwg
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