ES,
I answered this for you once before suggesting the manual lock mechanism from Rock Exotica. It may have been superseded by the ORCA, but they may make both still.
Otherwise, I'd be surprised if you can't find some Petzl ball lockers somewhere. Perhaps NOS in some store.
But why so particular?
Have you considered the BD magnetron mechanism? They seemed very easy to operate when I played with them.
Best,
PhillipIvan - Still happy with Screw Locks for everything.
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