hi guys, i'm having a bit of a problem trying to replace the rear O/S seatbelt in my 2000 lantra wagon,

the bit thats causing some grief is when trying to separate the seatbelt itself from the cradle that it sits in that comes out of the roof,

i have undone the bolt that fastens the cradle to the roof, but it appears that the cradle and the seatbelt are riveted on, well i think it's a rivet, as this is the problem, i cant seem to find a way of separating the cradle fro the belt bracket, so if anyone knows of a way to this without grinding the thing i would appreciate some advice.