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... e to carefully polish and polish the burrs and flash on the surface of the trigger, making the surface as smooth as possible.
After the polishing was complete, Lynn picked up the iron drill and drilled a hole in the trigger, connecting it to the linkage.
The size and position of the hole must precisely match the linkage.
The production of the linkage, like the trigger, also needs to be made of iron.
Ensure that it has sufficient strength and toughness to prevent b ...
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