I agree with Bianchigirll that having the shell faced might fix it. I had the same problem you describe with my Gitane TdF--new bearing balls, cones and spindle were apparently in perfect shape, etc. I solved the "indexed spinning" problem with a new Phil Wood bb, but before I'd spend that much money again I'd DEFINITELY try facing the shell first. I think that a minute amount of "out of parallel" between the faces could produce the problem I had, and if everything else is okay I just don't see what else could be causing it. Wish I'd thought to try it before I shelled out the big bucks for the new bb. If you try it, let us know how it works.