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Unused part in Airport Extreme upgrade

Due to the phillips screw being too tight, I was unable to complete step 14 in the guide to upgrade to Airport Extreme.

The screw in question holds what appears to be a grounding contact.

Airport works fine without it.

Am I putting my Mac at risk by having the Airport Extreme card not grounded (if it is a route to ground)?

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I believe that grounds out to the top case.

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Maybe both, as the contact was in touch with a fine metal mesh tube on situated just above the left USB ports.

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Probably not, the airport card makes contact in many other places other then that contact.

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Paul will be eternally grateful.
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