You may already know this, but the stock belts already have this feature. While seated, pull the lap belt retractor all the way out, then feed it back in until it is really snug. It should lock there, holding the lap belt tight. The shoulder harness doesn't do this - too bad - but this should help.Bob said:Has anyone used the CG-Lock with their stock seat belt. It is designed to hold your hips into the seat. It is advertised in Grassroots Motorsports as SCCA National SOLO compliant. What do you think? :-?