Remove the 3 way pan head by unscrewing in an anti-clockwise direction. Fit the 1/4"-3/8th" thread adapter to the Nodal Ninja 180 centre hole and screw the NN180 onto the Velbon tripod in a clockwise direction.
The NN T20 adapter screws to the bottom of the camera with the centerline to be aligned with the dead centre of the lens barrel. (Extremely important)
Then sit the NN T20 attached to the camera on top of the NN180 arm and using the threaded knob from the underside screw it into the NN T20.