Soigeneris - your resource for hi-tech hobbies. Taig radius turner (1210)
What Is A Radius Ball Turner? - Summit Machine Tool
LittleMachineShop.com Large Ball and Radius Turning Tool - Designed to Cut Round Shapes or Curves in Brass, Aluminum, Steel, Wood or Plastic on your Bench Top Metal Lathe (2568) - - Amazon.com
Universal Ball & Radius Turning Attachment with 10mm Shank 5 Pce HSS Tool Bit | eBay
mY QUEST FOR A RADIUS BALL TURNING TOOL | The Hobby-Machinist