[Doug G]

If you are trying to lose the weight of an attached hub, get a portable bandsaw or borrow one from a plumber type, they use them for cutting metal pipe in the field, Milwakee makes a great one. Use the portable band saw to hack most of the hub off. We did this in 2003, with a bunch of donated gears and sprockets and saved several pounds of weight. Last year we tried to use a lathe to turned down a sprocket hub and it sucked, found out later that the spocket has Stainless which is more difficult to machine. My advice is to use a portable band saw.