This is one of the better pictures that I've seen for the flow. I've also seen one in person. Here's what I'm curious about:

Is it only thru bolted to the hull in the 3 spots? Or is there hardware that I'm not seeing that attaches the base to the hull beyond that is visible from the face?

If it's only thru bolted in the 3 spots (not on the spring loaded pin), then does that mean that the blade is really being held on by pretty much the one bolt that it pivots on and the tension provided by the two bolts that sandwich the backing and the face plate around the blade?

I'd love to see an installation instruction for this once someone gets their hands on it...