I think this is going to get problematic fast. I just measured the rear dropout on my 2005 520 frame AND my 1995 520 bike/frame and they are both identical....9+ mm. The rear axle also measures 9 mm (actually around 9.6 mm). Are 10 mm axles actually <10 mm in diameter? And I thought the wheels would be the most straight-forward part of this build.