I am making a barrel and am now at the point of making the hoops. The hoops at the end of the barrel have a gap. The hoops closer to the center have no gap due to the reduced arc of the staves. I made a jig to bend the 0.020 metal strap to the circumference I need but I can't get the 15-20 degree conical shape to eliminate the gap. I tried cutting a circle with a 15 degree inner ring and tried to bend the hoop. but it is too stiff. Any suggestions? A cooper does this by hammering the hoop, but at 72 years old I'm looking for an easier method.