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.

Attached Files
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"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