Spiral window balances are a common mechanism used in vinyl, aluminum, and older wood windows to help sashes open smoothly and stay in place. Over time, these balances can lose tension, causing windows to slide down, feel heavy, or become difficult to operate. Knowing how to use a tensioning tool for spiral window balances is an essential skill for proper window maintenance and repair.

This guide walks you through the process safely and effectively, whether you’re a professional technician or a knowledgeable DIYer.

What Is a Spiral Window Balance?

A spiral window balance is a spring-loaded metal or plastic tube mounted vertically in the window jamb. Inside the tube is a spiral rod connected to a spring that counterbalances the weight of the sash. When the spring tension is incorrect, the window will not function as intended.

What Is a Spiral Balance Tensioning Tool?

A spiral balance tensioning tool is a specialized tool designed to engage the tip of the spiral rod so it can be safely rotated. This allows you to increase or decrease spring tension without damaging the balance or risking injury.

Using the correct tool is critical. Attempting to adjust spiral balances with pliers or makeshift tools can cause the rod to snap back suddenly.

Tools and Safety Preparation:

Before adjusting the balance, gather the following:

• Spiral balance tensioning tool
  
  

• Flathead screwdriver (optional)
  
  

• Safety gloves
  
  

• Eye protection
  
  

Safety tip: Spiral balances store energy. Always maintain a firm grip on the tensioning tool and keep your face and hands clear of the rod’s path.

How to Use a Tensioning Tool for Spiral Window Balances

1. Remove or Secure the Window Sash

Raise the sash a few inches and tilt it inward if it’s a tilt window. For non-tilt windows, you may need to remove the sash entirely to access the balance safely.

2. Locate the Spiral Rod

You’ll see the exposed tip of the spiral rod at the bottom or top of the balance tube. The tip usually has a slotted or notched end designed for the tensioning tool.

3. Attach the Tensioning Tool

Insert the tensioning tool securely onto the spiral rod tip. Make sure it’s fully engaged before applying any force.

4. Adjust the Tension

• Rotate clockwise to increase tension (turning to the RIGHT)
  
  

• Rotate counterclockwise to decrease tension (turning to the LEFT)

Most windows require one to three full turns. Add tension gradually and evenly to both sides of the window.

5. Lock the Balance (If Applicable)

Some spiral balances include a locking mechanism or clip. Engage it once the desired tension is reached.

6. Reinstall and Test the Sash

Reinstall the sash and test operation. The window should stay open at any height and move smoothly without slamming shut or drifting down.

Common Mistakes to Avoid

• Over-tensioning the balance, which can cause the window to shoot upward
  
  

• Adjusting only one side instead of both balances
  
  

• Using pliers instead of a proper tensioning tool
  
  

• Ignoring worn or damaged balances that should be replaced instead of adjusted
  
  

When to Replace Instead of Retension

If the spiral rod spins freely without resistance, the spring is broken. In this case, learning how to use a tensioning tool for spiral window balances won’t help—the balance must be replaced.

Conclusion

Understanding how to use a tensioning tool for spiral window balances can extend the life of your windows, improve safety, and restore smooth operation without costly replacements. With the right tool, proper technique, and attention to safety, spiral balance adjustment is a straightforward and valuable skill.

If you’re working on multiple windows or managing repairs professionally, keeping a quality tensioning tool on hand is a smart investment. For more information or assistance placing an order, Contact Us Today! The WHD Team will be happy to speak with you.