Yea that Sucks.. it took me awhile to get it back in.. what happens is; When you slam on your brakes theres a weight that goes forward which locks the seatbelt so the person does not go flying...
so what you have to do is, get the seat belt in the angle that it would be in the car and kinda jiggle it around.. if u look close when you pull the belt u can see the locking happen.. just get it in a level postion that it sits in while bolted in the car and just play around till u get play.. But once u pull a few feet out dont let it go back in till you bolt both ends in place... Hope this helps you some.. good luck, PS:::: take your time..