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A simple device is described which allows copper crystals to be bent elastically and plastically with cylindrical curvature down to a radius of 1 m, without destroying the homogeneity of the mosaic structure. This is proved by measurements with a γ-diffractometer. The focusing behaviour of a bent monochromator, designed for the modified Laue technique, is as expected and the crystal reflects nearly homogeneous neutrons in the wavelength band 1.3 ± 0.05 Å with a reflectivity of 30%.