Regular puller with 2 pieces of 1/4-20 or 5/16 all thread.
Clean the small holes/threads before trying.
Then make sure they go in at least 1/4-1/2 in. in before attempting to pull.
Salt water can make it difficult to pull, might need propane torch.
Did you pull the slotted screw thinking it's a drain plug?
Find a parts diagram to see what's in past this carrier.
There's pieces that get buried in gunk that need to need removed before the rest comes out.#23 pry them out of the groove.
I think you might find a U-tube video to help?(maybe)
Ask on here if you have trouble, you can screw this thing and getting it fixed might be impossible.