Stanchion mounts on H410

[cruisingretired]

I am looking for information on how the stanchion bases are mounted on the H410. Are they thru-bolted or just screwed into the bulwarks? I have a few that need to be re-bed and are leaking and wondering how involved this will be as far as accessing the underside if they are thru-bolted.

 

[Sailgunner]

Screwed in as I remember.
Asking about 410 but your bio indicates 30T. I went from a 30T on a lake to a 410 for coastal cruising.

 

[Knotallthere]

My 356 has aluminum blocks glassed to the underside of the deck and the stanchions bases screw into the aluminum, I would suggest the construction would be very similar if not the same.