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Knurled nuts GN 827.1 are used with adjusting screws GN 827 to secure settings and positions in place by counterlocking. For processing and assembly equipment on which attachments and mechanisms must be regularly exchanged, particularly simple adjustments can be achieved by combining adjusting screws GN 827, knurled nuts GN 827.1 and bearing blocks GN 828 of the types UA and UB to ensure that settings are retained even between uses.