Super idea thanks. If you're doing a lot of one size these aren't too badly priced in the smaller sizes.
http://www.summitracing.com/search/?...20beader&dds=1They use a tapered threaded pin that pushes ball bearings out further as you turn it. I have seen what looked like a tube cutter with rollers one side and a cutting wheel on the other. Instead of working on the outside it had a radius on the cutting wheel and worked on the inside. I haven't been able to find one so may fnish up making one.