I’m repairing the mast step in which the “donut” had rotted away. Everything else is in good shape but the Mast tube doesn’t look in the original position. It rests against the stern side of the square mound the donut sat in. I can move it 1/2” in any direction. Is there a set angle the mast should be to the deck or do I just center the mast tube within the square mound the donut used to sit in.