John: It's a HSS 3/8" - 10mm diameter rod by Hamlet Craft Tools. I'd call it a shallow spindle gouge. My clamp has the brass rod and round disc as you describe as is an older model. It "bottoms" out just before clamping the gouge tight.
Per an internet search, I see Tormek has come out with an upgrade called the SVD-186. I may have to go shopping tomorrow.
I am off to Marc Adams School of Woodworking for seven days of hollow forms with J. Paul Fennell and want my tools as ready as I can make them.
Any advice is appreciated. Thanks, Doug