I took the female RCA and cleaned out all the internals so I was only left with outer sleeve. I then dremeled the hole till it was a perfect match for atomiser 510 screw end. I also put a fine slit in end of sleeve to allow the atomiser to screw in. I then used the male RCA inserted into other end of sleeve to make the + centre pin. I then spot glued them together then soldered to make joint perfect.
Hope that's clear.
It works really well and is a solid fitting.