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After the removed frame, the sides of the fold up crack are cleaned of the remains of fasteners, loose stone pieces and, if necessary, leveled with a quick-setting mortar. The difference in the range of the opening along its entire extreme fell should not outstrip 5 mm. Certain attention should be paid to the precise alignment of the underpinning side of the jamb, which will-power assure a established assist of the window and its demanding positioning.