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What do those wrenches mean?

Skill Level 1 — Beginner
  • May need a screwdriver
  • No disassembly
  • No training required
Skill Level 2 — Do-It-Yourselfer
  • Need basic hand tools
  • Some disassembly required
  • Some repair experience helpful
Skill Level 3 — Skilled Repair Person
  • May need specialized tools
  • Complicated disassembly required
  • Repair experience needed
Skill Level 4 — Trained Mechanic
  • Specialized tools or machinery needed
  • Complex testing and calibration
  • Advanced training required