Brooks repair question!

Does anyone know how to get the nose bolt out of a Brooks saddle? The ~14mm nut seems to be attached to the bolt, and the whole thing turns and turns. Nothing seems to be unscrewing from anything else, and there’s nothing to grab onto that isn’t the nut.

Brooks B72 saddle repair, originally uploaded by BikeTinker.

I intend to put a new frame on Angelina’s Brooks B72. I bought the saddle from a fellow on the RBW list, broke a rail, fixed it with a sleeve, broke the other rail, fixed it with another sleeve, and then the whole bottom part gave way. Another fellow on the RBW list gave me a B72 with wrecked leather.

It’s finally time to put the two saddles together, so I drilled out the rivets and got ready to do it, but I can’t figure out how to remove the nose piece.

I don’t want to drill out the nose rivets – I’d like to move the nose, bolt and hardware right over to the other chassis.