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I think they are self tapping bolts, or there is a threaded metal sleeve he is bolting them into. I will let you know as soon as he lets me know. Ours are all screwed together and then we just unscrew them when we move.
You can always re caulk.
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when I was little I dreamed of giant snakes and dragons.... now I live with them.
Dr. Ian Malcolm: "Oh, yeah. Oooh, ahhh, that's how it always starts. Then later there's running and screaming."
Jurassic park
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