Part 1 : [ Ссылка ] (Introduction)
Part 2: [ Ссылка ] (Main Body)
Part 3: [ Ссылка ] (Hardened Punch)
Part 4: [ Ссылка ] (Optical Lens)
Hardening a centre / center / dot punch by heating to 770 degrees and quenching in water. This is the third video in the series, check the links for the other videos.
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