Hi Lafecto, not much will happen actually. RingT attached to the TB.
With the RingT I would make sure you have found the No Parallax Point.. meaning move the camera forward and backward inside the RingT.
Once you have found the NPP you will see a small pin hole in the top zenith. The way to fix this is to loosen the RingT screw a little bit and tilt the lens up and tighten the screw while the lens is on a 'Hair tilt up' skew. That will make a corresponding bottom black square a little larger. Typically we place a nadir downshot patch OR use tripod cap picture Panoweaver calls a "Floor".
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EasyPano - Panoweaver