This is not how my compression post was and but I will tell you how is is now.
In my bilge I have a ss shoe that is substantial and has tabs that generally form/slope to the shape of the bilge at that area (on top of my lead keel). It has a flat bottom with a ss pipe 3 1/2" ID welded to that flat bottom. The shoe sits in a bed
and I have tabbed in with fiberglass
the ss tabs to the hull
. The compression post has an outside diameter of 3 1/2" with a 3/8" +- thick plate welded onto the top end of the post. The deck has a 3 1/2" hole cut through it. The compression post slides through the hole from outside and then down into the shoe/sleeve. In the shoe/sleeve two 1/2 diameter ss pins slide through two 1/2" (one above the other) holes that are in both the shoe/sleeve and the compression post. These pins lock the compression post to the shoe/sleeve. I have put four 1/2" diameter threaded holes into the corners of the ss plate and matched my aluminum
deck step with aligning holes. I then have 3 1/2" x 1/2" ss bolts that bolt the deck step to the ss plate (this is all above the deck). The 3 1/2" bolts then carry on down through 1/2 holes that I have put through my deck. Now when you are inside the boat you will see the bolts sticking through. Then because I have a flat deck (Corbin 39), I have taken two (1 on the starboard and 1 on port side of the compression post) 4" x 4" x 1/4" T6061 aluminum
angles bolted to these protruding 1/2" ss bolts up tight to the ceiling. These angles run from my compression post (actually from about a foot further toward the bow) back to a bulkhead in my pilothouse and are supported there (about 11'). These four 1/2" ss bolts pull the angle up to the underside of the deck and then up to the underside of the ss plate that the deck step sits on. This is all sandwiched tight with sealant
in between providing a very good seal and more support for my flat deck. It is also glued along the lenght.
My mast and rigging forces come down on my compression post while my deck gets additional support from the hanging angles.
My deck is in fine shape, I just know that "flat" is not very structural geometry and so added some help. It also provides an excellent chase to get from my mast back to my instruments in my pilothouse. Being 4" deep and 10" wide it will also provide for air distribution if I add air conditioning
in the future.
I know the above is pretty wordy, I'm just trying to be clear.