Originally Posted by
GrainBrain
it seems there are three different diameters - the 10mm thread, then a smooth diameter larger than the thread where the bearing sits, then another... A micrometer would be handy at this point.
Oh, you're right. It does look like the axle is bigger where the cone/bearing sit.
I finally got a digital caliper, myself. Was very inexpensive on ebay and seems to work well.