When the Marine bearing bush is in free state, the two end faces should be higher. When the bearing pad is pressed to the middle of the bearing seat, the end face should be higher than the boundary plane of the bearing seat. When the bearing cap is screwed too tight, the Marine bearing bush will deform to too small a height, and there will be a gap at the joint, and the tightness of the Marine bearing can not be guaranteed, resulting in loosening and rolling in the work. If it is too high, it can be filed or put the sandpaper flat on the glass, and the height of the tile that is too small should be selected again.