What we have done different is this, our skinny bar is smaller in diameter than a standard 28 spline a stock 108mm CV would use and its made from 300m, We have rolled the spline onto a ground piece of the material that during the rolling process raises the spline above the center diameter of the bar (this is done with all rolled splines DSS uses), what this also does is allow us to make the axle with out any internal snap ring (no internal groove for a square edged stress riser during torsional shock loading) We then make the Big bar