It's a warrior, and I've been trying it with the battery out the entire time and it makes no difference unfortunately
The Acolyte has this section below the emitter area that is much thinner and immediately below that is the activation switch assembly and so the QC cables section and other wires are bunching up around the bottleneck area stopping the LED unit from sliding all the way down. As it was a pushed/forced in LED that appeared to cause the initial LED cable break that stopped it working when I first got it I'm very reluctant to even attempt any force in that area.
It's easy to see what is needed; find some way of hooking and pulling the wires down into and around the thin neck area but doing it blind and hoping you can unhook it when it is in the right place.
I was hoping that someone has perfected the technique on Initiate bodies!