It sounds like your tail piece ( the thingy that looks like a cigar tube ) is screwed all the way down to the bridge plate. That way there is no space between the cigar tube and the bridge plate.
I think that's the cause of your string beeing "jammed".
Try raising the cigar tube. you could do this by turning the 2 hex-screws
on the cigar tube ( the two smallest holes ) counter-clockwise i think.
