Air conditioning compressor question

Beast535

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Hi there

Can anyone tell me if there is anything missing from this compressor coupling on the front? I was told by a garage that it looks like something is missing and that's why my air con probably is not working. Now I've looked and although it does look different from a lot with the extra bit in the middle, it seems this is simply a different sort if coupling. When the pulley is turned it rotates the middle pub and you can hear it moving the parts inside. So surely this is working correctly?
 

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