Unplug the 4-pin molex from the backplane

Has anyone been able to unplug the 4-pin molex from the backplane? The connectors are tight. I end up using the existing connectors and building my custom cable on top of it…

From the backplane, or the power distribution board mounted next to the PSU?

You should (I have, others have) been able to umplug the molex connectors from the power distribution board. Yes, they’re a bit snug, but they come out with a bit of wiggling and perhaps careful coaxing with some pliers.