How to Replace a Broken Window Sash Lock and Cam Mechanism

## Why Functional Sash Locks Matter A window sash lock is not merely a security latch. When you rotate the cam lever, the curved hook draws the top and bottom sashes together, compressing the horizontal meeting rail weatherstripping. If the lock is broken, loose, or stripped, air leaks freely between the two glass panes. ### Step-by-Step Replacement: 1. **Remove Old Lock:** Unscrew the two mounting screws securing the lock body on the lower sash and the keeper plate on the upper sash. 2. **Measure Distance:** Measure the exact distance between screw holes from center to center to ensure proper alignment. 3. **Fix Stripped Holes:** If the screws spin freely, coat three wooden toothpicks in wood glue, insert them into the hole, trim flush, and let dry. 4. **Install New Cam Lock:** Fasten the new lock body and keeper, ensuring the cam smoothly engages without forcing. For broken sashes, cracked glass, or whole-home hardware upgrades, call ServiceFind Windows Pro for a **Fair Quote**.