The one rule: wind and adjust torsion springs only with correctly sized steel winding bars — never a screwdriver, drift pin, or improvised tool.
Why it matters: a wound torsion spring stores enough energy to break bones or worse if a tool slips or a cone lets go.
Why torsion springs are dangerous
A torsion spring mounted on the shaft above the door stores the energy that counterbalances the door's weight. When it is wound, that energy is held by the winding cone's set screws gripping the shaft. Anything that releases it suddenly — a slipping tool, a stripped set screw, a spring failing — turns the bars or the cone into a projectile.
The right tools
- Winding bars: correctly sized solid steel bars that fully seat in the cone holes. Too small a bar can slip out under load.
- Locking pliers (vise grips): clamped to the track below a roller to keep the door from rising while you work on the counterbalance.
- A properly calibrated driver: set screws on winding cones and cable drums are tightened to the manufacturer's spec so they grip the shaft without stripping.
Safe sequence (the idea, not a how-to)
Secure the door, control the spring with seated winding bars at all times, keep your body out of the path of the bars, and never remove tension by guessing. Match a replacement spring exactly: wire size, inside diameter, length, and wind direction all have to be right for the door's weight and balance.
Extension-spring systems have their own rule: each spring must have a containment (safety) cable run through it, so a break can't send the spring flying.
What the exam asks
Expect questions on the correct winding tool, how to secure the door before servicing the counterbalance, the four parameters that specify a replacement torsion spring, the role of cable drums and lift cables, and the safety cable required on extension springs. These sit mostly in the Tools, Technical Knowledge, and Safety areas. Drill them in the practice test and read the reasoning in the study guide.
Practice the spring & counterbalance questions
Filter the quiz to Tools and Technical Knowledge and work the spring, cable, and drum questions until the reasoning is automatic.