I'm guessing if it were one piece it would have no structure, therefore constantly flapping around the bay.
Aloooominum is also much lighter than silicone, so it's usually best to use as little silicone as poss, tho in this application that's not relevant.
Plastic is even betterer...
@Hefty started
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I'm guessing if it were one piece it would have no structure, therefore constantly flapping around the bay.