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John: I thought the two holes on the hood are recesses for an additional locking mechanism.

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Thanks for the answer. I guessed that must be the case. Any particular name for that form of lockup? (anyone?)

Rolf and DrD,

Thanks for posting.

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It looks like a version of "Der Jägersche Vertikalblock-Verschluss" to my eyes but I'm an ecologist not an engineer