How to switch from RHN to Fedora

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http://forums.fedoraforum.org – Vendor of an expensive lab tool provided a controller with RedHat 5 but failed to register it. So yum refuses to install mbadm. Source code website is broken. Is there an easy way to make yum get things from fedora and switch back when we get a chance to beat on our vendor for the RHN subscription? (HowTos)