What I was told by Roger Newton was that, when setting up a hard shaft, the middle of the dog should be approximately even with the bottom of the sponsons at the sponson transom as an initial setting. After that, you move it up and/or down to trim the boat's ride as needed. To facilitate this, some used silicone caulking or tape on the hull bottom to seal around the stuffing tube to make adjustments easier. When the final setting was determined, the tube was epoxied in along with, in some cases, the strut