In general, if there is a ready made mold template, only the processing cavity and core are needed, and the fitter will be able to do the hole assembly.

 If everything starts from the beginning, we should start from the starting material, milling, planing, grinding, the shape of the template, and then starting the processing cavity, core and so on. The machining cavity and core are usually machined by wire cutting, electric spark, CNC milling machine or machining center.