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Hidden blade

Materials used
  • Ball bearing slide (mine was 25 cm / 10 inch)
  • Nut and bolt
  • Rivets
  • 2 springs (a long one, and a short one)
  • Solid copper wire
  • A (key)ring
  • A string
Tools used
  • Hacksaw
  • Soldering iron
  • Dremel
Patterns
    Templates