screen cylinder 1 is thus expanded in the radial direction of the screen cylinder 1 for the purpose of mounting the end ring 5 fig6 is a schematic representation of a possible crosssection of the end ring 5 when using a shrink fit the shape of the cross section resembling the end ring 5 shown in fig2 to 4 the shape of the outline formed by the outer dimensions of the cross section of the end ring 5 shown in fig6 also substantially resembles a square or rectangle but material is missing from the outer circumference 8 of the end ring at the section surrounding the screen wires 2 and support rod 3 so that the shape of the cross section of the end ring 5 resembles the letter l the surface a in the axial direction of the screen cylinder 1 and settling against the support rod 3 then forms the part 8 u2032 of the outer circumference 8 of the end ring 5 the surface b which is the surface perpendicular to the axis of the screen cylinder 1 is at right angles to the surface a in the axial direction of the screen cylinder 1 and forming the part 8 u2032 of the circumference 8 of the end ring 5 the dimensioning of the surfaces a and b can be done as in fig2 to 4 the embodiment shown by fig6 can also use a notch 7 or a groove made on the surface a to form a mechanical joint between the end ring 5 and support rod 3 further the joint between the.