How do you remove seat belt casing to clear jamming?

I had the rear driver side seat belt lock into position tight against the seat - I picked and pulled with no luck. I also had the service light needing reset so I super glued my wallet to my pants pocket and drove to the Volvo dealer. He gave me free advice (shocking) and showed me how to reset the service light - it was so easy I didn't even take the time to write it down, now I can't remember and have tried all the tricks on the net with no luck. Then came the seat belt release secret that I've beating myself up over. The tech walks into the garage and comes back with a wrench in his hand (?) then unscrews the floor bolt end of the seat belt, it retract in and then releases, then he screwed the bolt back in. I had a "duh" moment, all that time I spent picking at the seat end, and I did crack the plastic housing and made a mess of it.

Hope this is the answer you're looking for, Dennis