I have a 27.2 titanium seatpost that was used in a frame with a set screw type post clamp. As a result there are several big dents in it. I am going to cut a hardwood block out with a 1-1/16" forstner bit and then slice it in half with a band saw. Then I will clamp the dented section in the vice. I have a piece of steel bar stock I am grinding down to the inner diameter of the post. I will then hammer this in from the bottom (don't worry I'll use lots of grease and have drilled a hole through the bar to I can put a long 6mm allen key through it and turn it out. It's gonna be fun, but is taking forever to do because I have to use the grinder at work and need a friend to find time to help me make the clamping block... This is the same idea we are putting forward here.... I like the idea of hammering a hardwood drift with a pretty solid taper on it. That should work, but it should be clamped in hardwood also. Once you have this set-up you will be able to fit other out of round BBs.. don't worry your BB wasn't 100 percent round to begin with.. You have to be damn good with the torch not to distort it a little when building.