or the unit may be removed from the completed shaft fig3 shows an assembly which is essentially the same as that shown in fig2 with the same reference numbers being used instead of the coating easily deformable sealing rings 45 46 47 48 have been inserted in front of the plug the assembly illustrated in fig4 is essentially the same as that shown in fig3 but it does not comprise any sealing rings which means that there is required a press fit which cannot be released even when the sleeves 36 37 are radially expanded alternatively it is necessary to provide a highly viscous fluid closing the gaps between the plugs 38 39 40 and the sleeves 36 37 fig5 shows a pressure agent probe 49 which is inserted into a camshaft composed of cams 34 35 and tubular pieces 31 32 33 as well as sleeves 36 37 the probe 49 comprises an inner bore 50 radial bores 51 52 and seals 53 54 55 56 arranged in pairs and symmetrically relative to the radial bores 51 52 when pressure is applied the sleeves 36 37 are deformed radially beyond their limit of elasticity thereby producing a force locking connection of the tubular pieces 31 32 33 in the region of the cams in the left hand half of fig5 the end pieces 57 58 of the tubular pieces 31 32 are inserted into each other.