Mazda 323 A/C Compressor Noise?

I have been having a strange noise from the engine especially when and after using the A/C. I took the drive belt off the compressor to check the pulley bearings. The outer part of the pulley moves freely with no rough noise, although slight side play. The centre part of the pulley which I guess is the shaft that runs the compressor makes a clicking type noise when rotating by hand. I have no experience with compressors, so just wondering if this is normal?

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Chris Lewis
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