The heads are removed from the hinge bolts by means of the horseshoe key, which is also shown in Fig. 5, and which fits into the small holes these padlocks to each hasp, and there are sixteen hasps in all.
The bolts are all made solid except those for the hinges, which are made as shown in Fig. 5. The heads of these, while appearing to be made solid on the bolt, are really made with a thread, and the bolt shown in the bolt head. When these heads are removed the bolts can be pushed out through the back of the case, which will allow the hinges to hang free from the glass, and the cover can be lifted up enough to make the escape without disturbing the front hasps or bolts. It will be noticed, in this and other tricks, that a great part of the effect is gained by making the escape through some part of the apparatus which is not suspected by the audience, leaving that part on which their attention is fixed untouched.
After escaping from the case the performer must replace the hinges, bolts, etc., which is done as in the iron box trick. That is by removing the padlocks, screwing on the bolt heads, and then drawing the bolts through the holes in the glass by means of strings tied through the holes in bolts, after which the padlocks are snapped in place.
The cabinet may now be raised and the act is completed.