Restring blinds

Just trying to get some info, in process of redoing my day/night blinds. I have the SWC brand blinds and any info I have found online does not directly relate to these blinds. These blinds do not have springs in the top rail. I have restrung the blinds but having a hard time getting the strings through the cordlocks. Anyone have a good way to do this? Thanks for your help, Dave