It's the wrong chapter, but this tittle...
Now, just now, she is inventing things? This is not true, right? Because Shizuko is only using the knowledge she already had to make things she already knew. She isn't doing anything "new", right?
EDIT:
Read the chapter there.
They won't show how the screw is made? I can think about a way to make the external screw, with a simple tool they could make there, but the internal screw is more complicated.