Paper is laid over the stone when the image is fully inked and ready to be printed. On top of the paper goes the tympan and a high pressure grease is applied. The scraper bar fits into a yoke on the press and measures just slightly under the width of the stone so that when the pressure bar is lowered, the scraper bar is in contact with the tympan, thus applying hundreds of pounds of pressure to the stone. The leather of the scraper bar is also greased so it slides across the tympan to evenly distribute pressure and offset the image onto the paper.
