The attached figure is the outline of a nut, and the general shape can be associated with it. Of course, the nut is unscrewed with a "wrench" (it seems that "adjustable wrench" is needed). As for the "deep hole", how did it get into the deep hole? There should be a "place to put it in", because it is impossible to put a big nut directly into a hole smaller than it. It is necessary to explain clearly its relationship with the deep hole and related structure, or how to "disassemble" it.