the handling of the clothing holder 12 during its manufacture especially if the clothing 8 is coated the presence of axial bores 123 make it possible to thread several clothing holders 12 on a mandrel so that they may be coated together in the embodiment of fig1 the basic body 11 is provided with the face 14 towards bearing 3 it would however be just as possible to design the basic body so that it be provided with the face 15 away from bearing 3 this has the corresponding consequence that the clothing holder would be provided with the face 14 towards bearing 3 during assembly or disassembly the clothing holder would then have to be brought to the basic body via bearing 3 the basic body would then correspondingly be provided with the threads into which the screws are screwed in and the clothing holder would be provided with an opening for the insertion of the screw the embodiment shown in fig1 has the advantage over this embodiment that whenever the clothing holder 12 is replaced new threads 117 are used each time since the opener roller is most often made of aluminum which is not very hard and could wear out the threads faster this is especially advantageous the opener roller partially shown in a section in fig2 also contains a fastener 4 by means of which.