Finally getting around to building up an olmo frame I purchased last summer. Was planning on building it up with some campy but I really want to ride it and don't have to cash to throw around for it. So I'm thinking of going with a more modern build with parts that I have, I want to use a shimano 105 group I have. My bottom bracket is 68 mm wide, so thinking english threading? I thought I had a couple that would work and the spindle length is right but they just slip inside of the shell, the threads touch but I can just push the cups inside. What do you think need to order? Thanks. Al.