There's tiny fiddly bits inside the position adjustment levers/cam assembly.
Tiny springs and ball bearings.
Both adjustment levers have a little tongue and groove arrangement that mates to the cam, and detents for the ball/spring.
I imagine they even annoy the assemblers at CRG, who likely have jigs and spare bits and lots of practice.
I've had several sets apart for cleaning and lubing to un-stick the adjuster, and others for re-anodizing.
It will build your watch making skills.