He also Justifies the _Registers_, making their _Cheeks_ truly Square. And Screwing them about an n from the Corner of the _Body_. He tryes that the _Male_ and _Female-Gages_ fit each other exactly, and lie directly straight along, and parallel to both the Sides of the _Carriage_. All this thus performed he needs not (perhaps) take the _Mold_ assunder again. But not having yet consider’d, or examin’d the length of the _Shanck_ of the Letter, he now does; and if it be somewhat too long (as we will suppose by forecast it is) then the _Body_ and _Carriage_ being Screwed together, and both the Halves fitted in their _Gages_, the Edges of the _Carriage_ and _Body_ are thus together rub’d upon the _Using-File_, till the _Carriage_ be brought to an exact length. Having thus (as he hopes) finisht the justifying of the _Mold_; and put it together, and Screwed it fast up, he puts the two Halves together, and then Rubs or Slides them hard against one another, to try if he can perceive any little part of the _Body_ Ride upon the _Carriage_, or _Carriage_ ride upon the _Body_: To know which of them it is that Rides, or is extuberant, he uses the _Liner_; applying it to both the Places, as well of the _Body_ as the _Carriage_: where he sees they have Rub’d or bore upon one another: And which of them that is extuberant, the Edge of the _Liner_ will shew, by Riding upon it: And that part he Files upon with a small flat and very fine _File_, by little and little, taking off the extuberancy, till the _Bodies_ and _Carriages_ lie exactly flat upon, and close to one another: Which if they do not, the _Mold_ will be sure to _Rag_. §. XVII. ¶. 1. _Of Sinking the_ Punches _into the_ Matrices. That the _Matrice_, and all its parts may be the better understood, as I shall have Occasion to Name them, I have given you a _Draft_ of the _Matrice_ in Plate, 18 at E. and shall here explain its parts. _E_ The _Matrice_, wherein is Punched E, the _Face_ of the _Letter_. _a_ The _Bottom_ of the _Matrice_. _b_ The _Top_ of the _Matrice_. _c_ The _Right-side_ of the _Matrice_. _d_ The _Left-Side_ of the _Matrice_. _f g_ The _Face_ of the _Matrice_. _h i_ The _Leather Grove_ of the _Matrice_. In the _Back_ or _Side_ behind the _Matrice_, just behind E is filed in athwart the _Back_, from the right to the left-Side a _Notch_, to settle and hold the point of the _Spring_ or _Wyer_ of the _Mold_ in, that the _Matrice_ fly or start not back when it is at Work.