C139 temperament change

"Ai, who should I look for to do this? This sort of thing could not be completed in just a few days. Most importantly, the blacksmiths of this era were all man-made. Can a man make such fine screws? "

Holding the blueprint in his hand, Chen Nianran felt a headache.

He came up with the idea, but found out that there was a problem with it.

"This thing looks very complicated