When the figure is drawn, how to make it is a problem. If we change it to later generations, we can find a simple punching machine directly. But in this era, without such advanced technology, it does not mean that we cannot process these things. In fact, it is more simple.
Carving, even corundum with hardness above 8 can be carved and shaped. Relatively speaking, stainless steel with hardness only 6.1 is not difficult.
Perhaps it is difficult for them to carve, but Zhao Xin has not only prepared one material.
I have remembered all the recipes as early as the time of refining