So the approach I used to secure the inner grid just wasn’t cutting it: The inner grid was not tightly secured. So I took a page from Andrew Seltzman’s liquid cooled grid by using telescoping ceramic tubes:
I had to file the OD 12.8mm tube with a diamond file to get it to fit inside the next larger tube.
Inside it’s wired together with wire nuts and teflon coated aircraft grade 24 AWG wire:
Note: we ended up using a shorter and thinner stretch of wire than pictured here, but this illustrates how it’s wired.
Here we see it all assembled:
Prometheus Fusion Perfection 