Nodal Ninja NN4 Tripod Head with RD16 II Rotator for Panoramas featuring For Spherical @ HDR Panoramas, Supports Up to 100mm Lenses 62mm Diameter/Nadir Footprint.
The order is as follows: 1) upload to the site spherical panoramas from which you plan to create a virtual tour; 2) from the list of uploaded panoramas add each panorama to the virtual tour (Add to 3D tour link); 3) open the created virtual tour, edit the panorama order, select the main panorama, set transition points (tunnels).