I don't think it's a tube , but a plate embedded in the layup of the hull. That is definitely the way it is in my N20 as I had to re mount it after too much beating on it trying to get out a broken bolt with a broken EZ out inside of it. My guess would be it's the same program with the strap as with the beam bolt.
"I said, now, I said ,pay attention boy!"
The cure for anything is salt water - sweat, tears, or the sea Isak Dinesen If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most. E. B. White