So after about five years of trying and failing I finally got the seatpost out of my 1970 Paramount!!!! To tell the truth I had given up about 2 years ago and settled with a monstrous cushioned spring seat to make the height bearable for me, and it actually did feel great. Then my wife got sick of the stock saddle on the Raleigh Capri I got her earlier this year and wanted mine, so after two days with the new seat too low I decided to do something about it today. I fed it WD-40 and pounded it with a hammer(gently of course) and no budging. So I put it in the hallway and kept giving it the WD-40 and subjected it to random acts of brute force, hehe. Every once in a while while I was walking past it I would "jump it" out if the blue and twist like hell, and about a half hour ago the beer muscles kicked in and it gave!!!!!!!! Now I have two questions...

1) What is the best way to treat the inside of the frame to get the remaining rust out?

2) Should I use the old Campy seatpost again or get a new one to avoid this problem in the future?

Bear in mind that I am not worried about keeping everything original on the bike, this winter is going to see a remarkable facelift and parts upgrade for it because it has found its last owner, well not its last hopefully because I hope with what I do to it that it may see even the next century. Your answers to these questions would be greatly appreciated!