Changing primary replication server

Hi,

I have two servers in my main site (SEPM1 & SEPM2) and two servers in my remote site (REMOTE1 & REMOTE2).

I'm currently replicating from SEPM1 to REMOTE1 however I need to change this to replicate from SEPM2 to REMOTE2, I can specify the remote server when creating the replication link but not the local server. I've seen a few links on the forums to a tech article about tempoarily changing the primary SEPM but it seems to have been removed. 

Hope you can help.

Chris