I don't know if anybody else knows this but team associated green slime for rubber o rings on their shocks works good for lubing the threads and o rings on flashlights which reqiure silicone based lube.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXSF70#tech
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXSF70#tech