Seeing he could not help himself, Cellini exclaimed before the officers and attendants: 'Very well! lock me up and keep me safe, for I give you due warning I mean to escape in spite of everything.' No sooner was he shut up in his cell than he fell to turning over in his mind how this escape could be made, and began minutely examining his prison, and, after discovering what he thought would be a sure way of getting out, he considered how best he might let himself down from the top of this enormous donjon tower, which went by the name of 'Il Mastio.' He began by measuring the length of the linen strips, which he had cut and joined firmly together so as to form a sort of rope, and he thought there would be enough for his purpose. Next, he armed himself with a pair of pincers which he had taken from one of his guards who was fond of carpentering, and who, amongst his tools, had a particularly large and strong pair of pincers, which appeared so useful to Benvenuto that he abstracted them, and hid them in his mattress. As soon as he thought himself safe from interruption, he began to feel about for the nails in the ironwork of the door, but owing to its immense thickness they were by no means easy to get at. However, he managed at length to extract the first nail. Then came the question, how to conceal the hole left behind. This he contrived by making a paste of rusty scrapings and wax, which he modelled into an exact representation of the head of a nail, and in this way he replaced each nail he drew by a facsimile of its head in wax. Great care was required to leave just a sufficient number of nails to keep the ironwork and hinges in their places. But Benvenuto managed this by first drawing the nails, cutting them as short as he dared, and then replacing them in such a way as to keep things together, and yet to allow of their being easily drawn out at the last moment. All this was by no means easy to contrive, for the governor was constantly sending some one to make sure that his prisoner was safe. The two men who were specially charged with this duty were rough and rude, and one of them in particular took pains to inspect the whole room carefully every evening, paying special attention to the locks and hinges.