How many margins are left in the locksmith's cutting? It is too small to file for a long time, but the flatness is not good enough
Install the blade after checking the blade must be straight, not twisted; sawing before stereo crossed, when cutting hands must be stable, not moving around, through the bow back with the eye saw blade, saw blade and parallel to the scribe, when cutting speed. Skills are practiced by themselves, not by overnight.
Bench sawing best reserved 1 mm margin, then fine, rasp file.
This phenomenon is caused by moving the wrist, but not by wire cutting. Margins are kept between 0.2 and 0.5 millimeters.
