ok, for this exploit you need any profession with a snare or root, and a burst run stim (if you are jedi, just use force run)
step 1: solo hk 58 aurek/besh using instructions from my previous post
step 2: go on to devastator. aggro it and snare or root it.
step 3: *this is the trickiest part* immediately after snare, hit burst run and run to the rod dispenser. click as fast as you can. the key is that the devastator wont make it to the door and lose agro before you get there. if you get one you've succeeded!
step 4: wait for devastator to go back to non-agro and drop rod into the RRU.
step 5: now you can kill devastator without needing to get more rods!
using this method i have amassed millions of credits selling devastator lava cannons and acid launchers.