Omega 850 1562 clasp part missing

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Hi, hope you are all having a great Sunday .

I recently bought a Speedmaster, but the claps doesn't work. I am not sure which parts are missing in the assembly. I assume a spring, a screw, and something else to keep it in place. Where would I find parts or an overview of the parts ? Or is my only option to try to find a new claps

 
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This might help identify what's missing.
Then maybe search eBay etc.