Vintage Japanese Chisel Restoration: Repairing Damage, Saving the Patina

Sympathetic restoration on this vintage Hidari-Hisahiro. Preserving the character. A new iteration of my Kanna Ura jig. It’s now stupidly simple. A note on the 3D files: Because hand-forged tools vary so much in dimension, my STEP file is tool-specific and likely won't fit yours. The design is simple enough to replicate just by looking at it, but if you still need the files, feel free to reach out. Chapters: 00:12 UNBOXING Phase 1: THE BLADE 00:52 Knocking off the handle丨柄を叩き出す 01:02 Squaring the edge丨直角出し 01:16 Flattening the back丨裏押し 02:03 Tapping out丨裏出し 03:25 Easing the edges丨あごの面取り 03:52 Cleaning up the tang丨中子の錆落とし 04:14 Straightening丨歪み取り 05:41 Scraping the Ura-suki丨裏透かし 07:54 Cleaning up the ferrule丨口金の錆落とし 08:30 Cleaning up the Katsura丨桂の錆落とし Phase 2: THE HANDLE 08:39 Timber selection丨柄材 11:04 Scribing丨墨付け 12:26 Seating the tang丨中子を差し込む 15:33 Fitting the ferrule丨口金の仕込み 17:57 Cutting to length丨長さ決め 18:09 Fitting the Katsura丨冠落とし 19:04 Final touches丨最後の詰め 19:43 Sharpening丨研ぎ 20:05 Blackening丨黒染め Phase 3: THE RESULTS21:09 TEST CUT Specialized Tools Used: Custom 3D-printed Jig (Material: PETG) 25mm Ball-end Rotary Burr – Coarse (Approx. 80 Grit) 25mm Ball-end Rotary Burr – Fine (Approx. 240 Grit) Hoop Setting Tool（下り輪打ち） Safety Note: Please ensure proper safety measures are taken when working with power tools and chemicals. Use eye protection and gloves at all times.