---
product_id: 103511297
title: "Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-4 (19-26 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows"
brand: "window repair systems"
price: "€ 42.31"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.hr/products/103511297-caldwell-series-300-block-and-tackle-window-balance-5-8
store_origin: HR
region: Croatia
---

# 27-inch precision length Optimized for smooth window balance 5/8-inch durable channel size Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-4 (19-26 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows

**Brand:** window repair systems
**Price:** € 42.31
**Availability:** ✅ In Stock

## Summary

> 🪟 Elevate your window game with precision and durability!

## Quick Answers

- **What is this?** Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-4 (19-26 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows by window repair systems
- **How much does it cost?** € 42.31 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/103511297-caldwell-series-300-block-and-tackle-window-balance-5-8)

## Best For

- window repair systems enthusiasts

## Why This Product

- Trusted window repair systems brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Ready to Install:** Single unit package, no batteries or extra parts needed—get your window balanced fast
- • **Robust Channel Size:** 5/8-inch channel delivers reliable strength and smooth operation
- • **Trusted Brand Quality:** Manufactured by Caldwell, a leader in window hardware innovation
- • **Lightweight Yet Durable:** Only 9.6 ounces for easy handling without compromising durability
- • **Precision Engineered Length:** 27-inch design ensures perfect fit for your window balance needs

## Overview

The 27" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance is a high-quality, durable window hardware component designed for smooth and reliable window operation. Manufactured by Caldwell, it features a precise 27-inch length and a sturdy 5/8-inch channel size, weighing just 9.6 ounces for easy installation. Perfect for professionals seeking dependable window balance solutions.

## Description

27" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 26-4

## Features

- 27" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 26-4
- 609613870835
- Hardware

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Caldwell Manufacturing |
| Part Number | ET-A24 |
| Item Weight | 9.6 ounces |
| Package Dimensions | 28.2 x 0.8 x 0.8 inches |
| Is Discontinued By Manufacturer | No |
| Color | Brown |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![Caldwell Series 300 Block & Tackle Window Balance – 5/8″ Channel, 27″ Length, Stamp 26-4 (19-26 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows - Image 1](https://m.media-amazon.com/images/I/31s5at3CSAL.jpg)

## Questions & Answers

**Q: Mine says "26 4 jq caldwell". is stamp 26-4 the right one to get? thanks**
A: Yes, that should be the correct balance for your replacement.

**Q: Mine is "86 26-3 eb5 cmc 1209". will this work?**
A: I would say no some of the manufacturers use different numbers but if you don’t see a 26 and you use a 27 not gonna fit I will go back and look at the chart or contact the vendor . I was going to get them from swisco 
But Amazon prime had free shipping the is a YouTube video from swisco check it out.

**Q: Does it include top & bottom guide as shown in picture? do i need to buy "prime-line h 3719 channel balance guide repair kit, 5/8-inch channel" also?**
A: The balances include the standard top and bottom guides as shown. If you have a different guide please call us at 1-800-482-0974.

**Q: I'm looking for a replacement to a window balance with a stamp 26 4 cw cmc 10. does the "26 4" option fit? where do i find info?**
A: Yes, that will be your replacement. The 26 on the stamp identifies the length of the balance from metal to metal. The balance is an inch more than the stamp. The 4 on the stamp identifies the sash weight that it can hold.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quick fix
*by D***G on December 7, 2024*

Easy to install and works great.

### ⭐⭐⭐⭐⭐ 100% complete pre-built (unlike others), ready to install replacement.  Very smooth operation, well built, good price.
*by E***H on October 3, 2016*

My vinyl sliding window broke and some string hung down the side. It fell heavily on one side while the other seemed ok. I was just glad I could close it again and lock it. I thought I would need to have it replaced. A quick search on YouTube showed that the problem was likely the window balancer and that they can be replaced easily. Removed the old balancer, looked at the part number, matched it up here on Amazon (the numbering format won't be exact match but the digits will be the same) and found this replacement part that comes complete unlike several others that require you install the plastic ends with rivets (why would they do that?). This one came complete and installation literally took 10 minutes or less. I replaced both to ensure they would operate evenly and now my window works better than new, no exaggeration. I am considering replacing other still functional window balancers in my house with these which make opening and closing the window smooth and easy to close. These shipped quickly and were well packaged. GREAT product.

### ⭐⭐⭐⭐⭐ PERFECT! Fast & thankful!!
*by J***L on May 13, 2024*

Fits as should, fast shipping & thankful to be able to use my windows!! Watch the numbered stamp on end for proper size to order. My local window supplier couldn't fo it right & THIS SELLER DID FABULOUS!! EXTREMELY SATISFIED TEN STARS!!!

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**Shop now:** [https://www.desertcart.hr/products/103511297-caldwell-series-300-block-and-tackle-window-balance-5-8](https://www.desertcart.hr/products/103511297-caldwell-series-300-block-and-tackle-window-balance-5-8)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-21*