座繰り

ざぐりzaguri

noun · suru verb

1. reeling by hand (esp. silk)
2. hand filature
3. counter sinking (making conical depression so screw-heads don't protrude above surface)
4. spot facing (machining a flat space for bolt head, etc.)
5. spotfacing
6. hollowing out (e.g. wooden chair seat, scallop pattern on roof, etc.)

Study it in Yanamino