SharePoint 2010: How to reset FarmAdmin WSS_WPG and WSS_ADMIN_WPG group memberships?

I have accidentally removed the FarmAdmin account from the WSS_WPG group on our MOSS2010 server. Earlier it was part of WSS_ADMIN_WPG and WSS_WPG groups. Now it's only WSS_ADMIN_WPG.

In User Accounts on the server, I cannot add him to multiple groups. I can however add him to administrators, but I'd prefer not to.

How can I reset the FarmAdmin account group memberships on the MOSS2010 server?
SynocusAsked:
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Justin SmithSr. System EngineerCommented:
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