Gas String Trimmer Mastery: Restringing, Operation, and Safety

The string trimmer (weed eater), invented 1972 by George Ballas (inspired by car wash brushes), is essential for edges, obstacles, and tight spots. Master the basics for efficiency and safety.

Restringing (Bump-Feed Head)

1. Press lock, rotate spool counterclockwise; remove
2. Remove eyelet/button; clean debris
3. Push spool to release tabs; remove spool
4. Feed line into lower anchor; wind following arrows
5. Secure lines in upper/lower grooves
6. Reinstall spool; thread lines through eyelets
7. Pull both ends evenly; snap spool home
8. Reinstall lock ring if present

Operation

• Safety gear: goggles, long pants, closed-toe shoes, hearing protection
• Fuel: 50:1 or 40:1 gas/oil mix (check manual)—NEVER straight gas
• Prime 2–3×; choke on; pull start; switch to run
• Right hand on throttle, left on shaft
• Cut at waist level; sweep side-to-side; keep head parallel to ground
• Advance line by tapping head on ground (bump feed)

Safety Essentials

• Debris flies—protect eyes, legs, bystanders
• Hot muffler—avoid contact
• Cool before refueling
• Inspect line condition frequently
• Store fuel properly