CG-Lock, a $39.95 seatbelt add-on that's already had success in performance-racing and first-responder vehicles, can also help improve safety and comfort in booster seats -- although the company notes that CG-Lock is designed for seats that use cars' factory-installed seatbelts to secure children. Easily attached with a few screws and a clip, the CG-Lock helps to stabilize your car's lap belt while leaving the shoulder harness unaffected, "preventing tipping, reducing rocking and bouncing, increasing safety, improving comfort, and reducing the potential for motion sickness," according to the manufacturer.
If you're looking for more detailed information, CG-Lock's site offers a number of videos of the product in action, including this one specific to the booster-seat application. Don't know about you, but to me, the kid seems to be having more fun in the "before" frame -- although there's no denying the improved ride in the "after" shots:
UPDATE 10/4/2007: We received a note from Lap Belt Cinch, Inc. CEO Charles M. Carter noting that the video previously linked to "had a flaw in it because in the one scene the child had his arm out of the shoulder strap. We recognized this flaw and have since re-shot the video to correct the flaw." New video is below:
