There is a small paddle wheel type mechanisim that locks the belt in case of impact. That's what holds your butt in the seat to keep you from busting through the windshield. Before I re-installed mine after new carpet, I kinda played with it and tried to figure what locked it, what released it. It was dirty from age, cigarette ash, hair, all kinds of creepy looking crap. Anyway, I pulled the belt all of the way out. You have to do it in ONE LONG MOTION or its locks like it was designed to. Use something to lock the belt to keep it from retracting, I used a screwdriver, and then vacuum the loose stuff. I sprayed some carpet cleaner in there as I was cleaning the belt also. I used a tooth brush and finger, then wiped clean and dry. Lastly, I used spray silicone. One other thing and it happened by mistake, don't torque the bolt too tight when re-installing. It causes the plastic housing to distourt against the carpet and press against the little wheel thingie. It was designed to swivel. If all fails, when you use the belt, use both hands. With your right hand, grab it by the end, and as you pull in a steady motion, grab the belt with your left hand after a foot or so and continue the pull until enough belt is out to latch it.