Mr. Otte is right on.

Those are Lang key locks. On some of them, you lifted up that lever and inserted a key into a slot. When you twisted it, the locks came off.

On other ones, you lifted the lever and twisted it. This released the lock.

I'm not sure which one that is, though.

And I think it is fully seated. There's a little gap under the tip of it so you can flip it open.

OWD


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