an axial elastic member or spring 210 and two rolling tracks 140 180 having the shape of an axial bar are mounted the balls 3 are arranged in three axial rows 20 which are transversely located at 120 u00b0 from one another the whole assembly of balls 3 with the rolling tracks 140 180 and the elastic members or springs 210 is closed at each axial end by a shoulder 15 and by a retaining ring 12 the retaining ring 12 engages into each of the axial grooves 131 171 of the inner shaft 1 the outer shaft 2 is provided with three axial grooves 132 172 transversely located at 120 u00b0 from one another which slide on the rows 20 of balls 3 the axial grooves 132 172 should have the desired length in order to enable the required axial sliding of the outer shaft 2 and the inner shaft 1 the balls are in contact on the one hand with one of the shafts and on the other hand with both rolling tracks the rolling tracks are in contact with the other shaft and can pivot in the shaft the rolling tracks are in contact with elastic members which are intended to maintain the contact between the rolling tracks and the balls at one point upon assembling the system the elastic members enable the size variations of the different components to be compensated it can be called tolerance absorption through elastic member deformation upon applying a torque the load is transmitted from the tube on the shaft through the balls and the rolling tracks the load application line goes through the centre of the ball and the pivot of.