DESIGNED FOR NON-TILT WINDOWS – The Series 40 Spiromite is made specifically for side-load/non-tilt sash windows. This model features a 3/8" diameter tube at 29" length with a Yellow Tip calibrated for 24–34 lbs sash weights. Ideal replacement for worn or failing balances. RANGE OF LENGTHS & WEIGHT RATINGS – Available in lengths from 10" up to 45" with color-coded coupling tips (White, Red, Blue, Green & Yellow) covering sash weights from 4–34 lbs. Choose the correct tube length and tip color for your specific window needs. Each balance is sold individually. SLIM “PENCIL” STYLE CONSTRUCTION – Compact 3/8" tube design fits neatly into narrow window channels while providing reliable lift support. Engineered for consistent operation and long-term durability in residential applications. STRAIGHTFORWARD INSTALLATION – Easy to install using standard tools. A practical, DIY-friendly repair solution that restores smooth sash performance without requiring window replacement or costly service. TRUSTED SINCE 1989 – WRS Window Repair Systems has over 30 years of experience supplying reliable, high-quality hardware. Trusted nationwide by homeowners, contractors, schools, and property managers for dependable repairs and long-lasting performance. The Caldwell Series 40 Spiromite Spiral Balance is a dependable solution for non-tilt (side-load) window systems, built with a slim 3/8 " pencil-type tube that fits easily into narrow window channels. Each balance uses a precision spiral rod to counterbalance sash weights, ensuring steady lift support and smooth window operation. The Series 40 line is designed to cover a wide range of residential and light commercial window repair needs: Tube lengths available from 10" to 45"

3/8" standard diameter for side-load window tracks

Color-coded tips calibrated for sash weights from 4–34 lbs

Sold individually for cost-effective replacements

Selection Guide: Measure the length of the metal tube only (exclude spiral and tip).

Confirm tube diameter (3/8" is standard for Series 40).

Match tip color to your sash weight range.

If your exact size or rating isn’t listed, contact WRS for assistance.

Easy to install with standard tools, the Series 40 Spiromite provides a practical and affordable repair option compared to full window replacement. Whether you’re a homeowner, contractor, or property manager, these balances deliver long-lasting reliability and consistent performance. Trusted since 1989, WRS Window Repair Systems has been the go-to source for durable, high-quality window hardware nationwide.