FIELD: measurement technology. SUBSTANCE: device has cylindric base having holes axially directed and entering the cavity of a ring-shaped groove in the base end face. Pins are inserted into the holes, the pins freely thrusting against a push ring and clamping nut. The base is optionally provided with cylindric threaded stem, on which the clamping nut is screwed on. The dimensions of nut thread are less than the internal diameter of the ring-shaped groove. The centers of the holes in the axial direction of the base are spaced over the frontal diameter of the ring-shaped groove. EFFECT: higher reliability of the device operation. 3 cl, 6 dwg
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