Longines Chrono with ETA 2894-2 - advice

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I’m trying to service a Longines with an ETA 2894-2 moment. It has a Dubois-Dépraz chrono mechanism.

I have read that the entire chrono mechanism detaches as a single unit and is designed to be cleaned without taking it apart. But this just seems… wrong to me.

Does anyone have any experience with this?

I recently restored an Omega 321 and 861, so I’m comfortable around chronos. But I just want to be sure.