SteamVR Door handle .. Door, Hinge Joint not Circle Drive.

As per title.

I have a door. A Door Handle.

I have setup the Hierachy as this: Door Interactable (hinge joint) - Door (mesh renderer, mesh filter, mesh collider convex) -Handle Interactable (hinge joint, interactable, myAttachSript.cs) - Handle (mesh, coliders

I can interact with the Handle and using the Hinge Joint it rotates as expected. BUT the interactable seems to block the movement of the Parent (Door and Door Interactable)

I can "push" the Door as it has a rigid body and a colider, and the hinge joint works great, but for some reason I cannot have the Handle Interactable behave as the child of the Doors?

I have a 'chest' with a more simple handle, and works as I expected, but it seems the Handle INteractable on the Door object is blocking child->Parent behaviour.

am I missing something obvious, its been a long week.