American Lock, unknown model, can't be gutted?
First the backstory...
I've been living at my current place for almost five years, now, and ever since (and even earlier, as this used to be my gradfather's house), I had seen this lock on the side of the house, just sitting there. Locked of course, but not securing anything except the ground wire it was attached to (which until now, I never really questioned). Also (as you'll see below), I had akways assumed it was super old and rusted over, due to it being outside in the elements for all these years. When I finally let my curiosity take over and I took a closer look at it, I saw that it was in actually quite good condition, and that it was an American lock. I'm still a beginner when I comes to picking, so sitting outside and trying forvever to get it off wasn't really an option. I talked to my grandfather, and he had no memory of the lock whatsoever, but allowed me to cut the ground wire in order to remove it, given that I then repair the wire afterward.
So here we are...
This is a recreated shot of how I had always seen it; you can see why I always thought it was just an old, corroded junker:
I've only had it in my hands for a couple of days (literally), now, and I've since managed to get it open (half-diamond to get what I think is a false-set, then rocking to get a full-set and open):
By the looks of things, it seems to have a removeale core:
But a closer look into the body reveals what looks like a rivet, rather than a screw of any sort (I hope I'm wrong):
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I've tried all different sizes of hex keys, alan keys, etc., and I just can't seem to unscrew it, leaving me to believe that it really is a rivet in there. I'll try to do a quick video of it being picked open if I get the time. Thoughts/advice?