| 摘要 |
It comprises a cylindrical piece 1 engaged with small clearance in a hole a with circular cross-section made in the wall A. The axial and angular immobilisation of the piece 1 is operated with the aid of a deformable ring 3 whose expansion is obtained by means of tightening a nut 5 provided at the end of a threaded rod 2 which axially traverses the said piece and the abovementioned ring. <IMAGE>
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