1950s: After transmigrating into a capitalist, I relied on military industry to achieve a comeback.

"I'll give you five minutes," Liu Dachui said through gritted teeth. "If you dare to mess around, I'll be yelling at you."

Lin Jiaoyue took the heavy tools, a confident smile curving her lips slightly upward.

In that instant, her entire demeanor changed. The delicate, girl-next-door type who needed protection vanished.

Instead, there is "Engineer Lin," a powerful and extremely calm and capable figure who will dominate the future world.

She wasn't wearing gloves; her slender, fair fingers probed directly into the oil-stained mechanical structure.

"Click, click."

Her movements were so fast it was dazzling; several screws were quickly removed and neatly stacked to the side. Next, she skillfully disassembled the firing pin housing.

A strong, sour smell of stale grease wafted over.

Everyone unconsciously held their breath and craned their necks to look inside.

Among the complex gears and levers, there was indeed a tiny pin, which looked somewhat awkward, as if it were broken, stuck tightly on the edge of the guide groove, and had even scratched a very fine bright mark on the guide groove.

"My God! It really is!" Song Siming adjusted his glasses, which were about to slip off, and exclaimed in surprise, his voice trembling.

"The pin was misaligned by about half a millimeter, and it perfectly blocked the reset stroke! Amazing! Absolutely amazing!"

Liu Dachui's face flushed red instantly, as if he had been slapped hard. He had been a fitter for half his life, and prided himself on being able to detect any machine malfunction by ear. How could he have been outdone by a little girl today?

"Then... what do we do?" Liu Dachui's imposing manner instantly diminished, and his tone softened involuntarily. "This pin is crooked and stuck so tightly; if we try to pry it off, it will definitely break. This is special steel; if it breaks inside, even a god couldn't save it."

"Who said we had to force it?"

Lin Jiaoyue chuckled and took something out of her pocket.

Everyone stared intently, and were completely stunned.

It was an ordinary, even somewhat worn, five-cent coin.

"What are you doing?" Gao Jianguo scratched his head, looking completely bewildered. "Making a wish by tossing in a coin?"

Lin Jiaoyue ignored him. She placed the coin on a piece of scrap iron, picked up the small hammer next to her, and swung it twice with a crisp, clean "bang".

The coin was instantly smashed into a slightly curved, thin sheet.

Then, she picked up the assorted file, squinted, and quickly polished the edge of the deformed coin a few times.

Amidst the flying sparks, a "strange gasket" with extremely sharp bevels and a specific curvature was born.

She carefully inserted the still-warm homemade "wasp" into the tiny gap between the pin and the guide groove.

"Old Gao, come give me a hand," Lin Jiaoyue called out without turning her head. "This is hard work."

"Here we are!" Gao Jianguo had been itching to get started and squeezed his way in like an iron tower.

"Press down the breech reset lever." Lin Jiaoyue's hand gripped the wrench firmly, her eyes focused.

"On my command, use only half your strength to press down. Remember, I need a sharp, explosive force, not brute force!"

"Alright! Just you wait and see!" Gao Jianguo took a deep breath, gripped the cold iron bar with both hands, his arm muscles bulging and veins popping.

Everyone around held their breath, not daring to make a sound.

"Three, two, one—press!"

At Lin Jiaoyue's command, Gao Jianguo exerted his strength.

At this critical moment, Lin Jiaoyue's wrench made a precise cut. Using the subtle lever fulcrum formed by the coin washer, she flicked and lifted her wrist with remarkable skill.

"Ding!"

A crisp, melodious metallic clang rang out.

The pin that was stuck there seemed to be under a spell; it slid back to its original position along the coin's slant.

Immediately afterwards—

"Clang—Crack!"

The breechblock, which had been half-dead, smoothly returned to its original position under Gao Jianguo's pressure, emitting an extremely satisfying locking sound.

A deathly silence fell over the workers' shed.

A few seconds later, the previously paused breathing resumed.

This works?!

A five-cent coin, a file, and in less than three minutes, this behemoth that needed major repairs was put back in its proper place? It's like magic!

Liu Dachui stared dumbfounded at the breechblock, now back to normal, his mouth agape wide enough to fit an egg.

He had seen countless ways to repair machines in his life, but he had never seen anything so wild, so ingenious, and so unreasonable!

Lin Jiaoyue patted the rust and grease off her hands, picked out the deformed and broken coin, tossed it in her hand, and casually tossed it to Liu Dachui, who was still in a daze.

"It's fixed," she said casually, as if she had only tightened a loose bottle cap.

"But this is only a temporary solution. The material of the pins is not heat-treated properly, which is a common problem with Soviet-made pins. They are bulky, rough, and not resistant to fine grinding. When I have time, I will go to the workshop and machine a few low-temperature resistant alloy pins for you to replace them. I guarantee they will work even better than the original ones."

After saying that, she stood up, shook her slightly sore wrist, and her nonchalant "this is nothing" expression was a hundred times more arrogant than Gao Jianguo's waving hand earlier.

"I'm...I'm truly impressed." Liu Dachui picked up the coin with trembling hands, staring at the incredibly precise polishing marks on it. After a long pause, he finally gave Lin Jiaoyue a thumbs up, his eyes filled with awe.

"Girl...! Which national treasure-level master chef did you learn this amazing skill from? I, Liu Dachui, have been doing this for thirty years, and today I've truly seen something new!"

Lin Jiaoyue smiled and was about to bring up her all-powerful "dead uncle" to make an excuse when a round of applause suddenly came from the entrance of the work shed.

"Slap, slap, slap."

The applause wasn't loud, but it was extremely powerful.

Everyone turned around and saw that Professor Sun Zhenbang, who was usually stern and unsmiling, was standing there at some point. Behind him were two officers wearing military overcoats with gold stars on their epaulets.

Sun Zhenbang's usually stern face now showed an undisguised excitement and pride.

He didn't look at the repaired cannon, but stared intently at the calm young girl standing in the snowstorm, then turned to his superior and said:

"Sir, I told you, there's a real dragon hidden in this training class."