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After the removed frame, the sides of the fold up crack are cleaned of the remains of fasteners, tossed brick pieces and, if demanded, leveled with a quick-setting mortar. The inconsistency in the measure of the birth along its uninterrupted peak should not better 5 mm. Certain publicity should be paid to the unambiguous alignment of the tuchis side of the jamb, which will-power assure a stout subsistence of the window and its precise positioning.