If your Silverline tilt windows no longer stay open, slam shut, or feel unusually heavy when operating, the problem is often worn or broken balances. Learning how to replace Silverline inverted block and tackle balances for tilt windows can restore smooth operation, improve safety, and extend the life of your windows—without replacing the entire unit.

This guide walks you through the process step by step, explains how to identify the correct balance, and highlights common mistakes to avoid.

What Are Silverline Inverted Block and Tackle Balances?

Silverline tilt windows typically use inverted block and tackle balances, a spring-assisted system designed to counterbalance the sash weight.

Key Features:

• Located inside the window jamb

• Uses a spring and pulley system

• Allows smooth vertical movement

• Supports tilt-in functionality for easy cleaning

Over time, these balances wear out due to constant tension, causing window operation problems.

Signs You Need to Replace Your Window Balances

Before starting, confirm that the balances are the issue. Common symptoms include:

• Window sash won’t stay open

• Sash drops or slams shut

• Window feels heavy or uneven

• One side moves differently than the other

• Visible damage or rust on the balance

If you notice any of these, it’s time to replace the balances.

Tools and Materials You’ll Need:

Before replacing Silverline inverted block and tackle balances for tilt windows, gather the following:

• Flathead screwdriver

• Phillips screwdriver

• Needle-nose pliers

• Replacement inverted block and tackle balances (correct size and weight)

• Safety gloves and eye protection

⚠️ Tip: Always replace balances in pairs—even if only one side appears broken.

How to Identify the Correct Replacement 

Choosing the right balance is critical for proper window operation.

What to Check:

• Balance length (metal channel measurement)

• Stamp or code on the balance (often includes weight rating)

• Sash weight

• Attachment type (hook, clip, or shoe style)

Silverline windows use specific balance configurations, so matching these details ensures compatibility.

The end attachments must match exactly, or the sash can bind, disengage, or tilt improperly. Please Note: the end attachment for Silver Line Balances is very unique and a key indicator if you have a Silver Line Balance vs. a regular Block & Tackle Window Balance. The end attachment of a Silver Line Balance will look like this:

Step-by-Step: How to Replace Silverline Inverted Block and Tackle Balances

Step 1: Remove the Window Sash

• Unlock the window

• Raise the sash slightly

• Tilt it inward using the tilt latches

• Lift one side up and remove the sash safely

Step 2: Release and Remove the Old Balance

• Locate the balance inside the jamb

• Carefully release spring tension

• Remove mounting screws

• Slide the balance out of the track

⚠️ Use caution—the balance may still be under tension.

Step 3: Install the New Inverted Block and Tackle Balance

• Insert the new balance into the jamb

• Secure it with screws

• Attach the balance shoe or hook correctly

• Repeat on the opposite side

Step 4: Reinstall and Test the Window Sash

• Place the sash back into the window frame

• Lock it into the balance shoes

• Tilt it back into place

• Open and close the window several times

The sash should move smoothly and stay open at any height.

Common Mistakes to Avoid

• ❌ Installing mismatched balances

• ❌ Replacing only one side

• ❌ Ignoring balance codes and lengths

• ❌ Forcing the sash into place

Avoiding these mistakes will save time and prevent further damage.

Frequently Asked Questions (FAQs)

How long do Silverline window balances last?

Typically 10–15 years, depending on usage and window weight.

Can I replace balances without removing the sash?

No. Removing the sash is necessary to safely access and replace inverted block and tackle balances.

Are Silverline balances universal?

No. They must match length, weight rating, and attachment type.

Conclusion

Understanding how to replace Silverline inverted block and tackle balances for tilt windows can save money, restore proper window function, and improve home safety. With the right tools and replacement parts, this repair is manageable for many homeowners and maintenance professionals. If you’re unsure about balance selection or installation, Contact Us Today! The WHD Team will be happy to assist you.