Not sure what it's called, but how do I fix it? "hull trim" screw/rivet

Last time I was on the water, this rivet thing came off. How do I repair? It's still holding on by one screw20140812_144218.jpg20140812_144228.jpg
 

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I'm not likely to ever need a rivet gun again, so what kind of shop should have the tool to fix it.
I'm not familiar with how they work or what the guns look like. Do I need a particular kind to do this job or any gun should work?
 
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