And if the axle happens to be too long, can it be filed down so it fits? I ask this because I bought an older wheelset, to convert from 27" to 700C. The front works fine, but the back QR won't tighten. I figured the cam was worn out--never thought to check the axle length. Thedropout opening and the axle appear to measure out to be the same length, but that's a difficult measurement when the axle is inside the hub. Shimano 600 hub with Mafac MA40 rim.