I'm looking for a source for a replacement cottered bottom bracket spindle for my late 60's Gitane. I know - it's French. The races on the spindle are pretty pitted. When adjusting the cups and lockring I can get it spinning nicely but then there's a little side to side play in the spindle. If I tighten it up to eliminate the side to side issue then the bearings catch on the races and it doesn't turn well.

I'd like to stay cottered because I've worked hard on shining up the original Nervar 52-36 crank but I'm not sure where to find a replacement. Any suggestions?