In the Plate of the _Register_, is made a long square Hole, as at _e_, just wide enough to receive the _Pin_ of a _Male-screw_, with a _Sholder_ to it, which is to fit into a _Female-screw_, made in the Edge of the _Carriage_, that when the _Male-screw_ is turned about in the _Female-screw_ in the _Carriage_, it shall draw the _Sholder_ of the said _Male-screw_ hard against the upper and under Sides of the square Hole in the Plate of the _Register_, close to the side of the _Carriage_ and _Body_. The reason why the Hole in the Plate of the _Register_ is made so long, is that the _Cheek_ of the _Register_ may be slid forwards or backwards as occasion requires; as shall be shewn when I come to justifying the _Mold_. ¶. 8. _Of the_ Nick. In the upper half of the _Mold_, at about a _Pica_ distance from the _Throat_, is fitted into the under-side of the _Body_ the _Nick_: It is made of a piece of _Wyer_ filed flat a little more than half away. This _Nick_ is bigger or less, as the Body the _Mold_ is made for is bigger or less; but its length is about two _m_’s. It is with round _Sculptors_ let exactly into the under-side of the _Body_. In the under-half of the _Mold_, is made at the same distance from the _Throat_, on the upper-side of the _Body_, a round _Groove_, just fit to receive the _Nick_ in the upper half. ¶. 9. _Of the_ Bow _or Spring_. This is a long piece of hard _Iron Wyer_, whose Diameter is about a _Brevier_ thick, and hath one end fastned into the Wood of the under half of the _Mold_, as at _h_; but it is so fastned, that it may turn about in the Hole of the Wood it is put into: For the end of it being batter’d flat, a small Hole is drilled through it, into which small Hole the end of fine _Lute-string Wyer_, or somewhat bigger is put, and fastned by twisting about half an Inch of the end of the _Lute-string_ to the rest of the _Lute-string_: For then a considerable Bundle of that _Wyer_, of about the Size of a Doublet Button, being wound behind the Hole, about the end of the _Spring_, will become a _Sholder_ to it, and keep the end of the _Spring_ from slipping through the Hole in the Wood: But this _Button_ or _Sholder_ must also be kept on by thrusting another piece of _Wyer_ stiff into the Hole made on the end of the _Spring_, and crooking that _Wyer_ into the Form of an S, that it slip not out of the Hole. The manner how the _Spring_ is bowed, you may see in the Figure: But just without the Wood is twisted upon another _Wyer_ about an _English_ thick five or six turns of the _Wyer_ of the _Spring_, to make the whole _Spring_ bear the stronger at its point: For the Office of the _Spring_ is with its Point at _g_, to thrust the _Matrice_ close against the _Carriage_ and _Body_. ¶. 10. _Of the_ Hooks, _or_ Haggs.