I'm guessing that the bolts are stuck in the each bearing. The back was the bolt at the thread, which has released some of the tension, but beacuse the bolts are in the bearing, they won't come out.
Is one of the bolts hollow, ie could you tap the other one out through it?
It is strange. I have been sent a link of what should be in the pivot but mine appears different. There seems to be something threaded in it. It makes hammering pointless. It let go with a hell of a bang, that much I do know!
Today's mood... Middling, middling to poor.