Here's a review I did on the stainless steel version of the tec accessories glow fob. I'm planning on changing the GITD pellet with a tritium pellet in future. When I do, I'll try post some info on how I do it.
http://keychainpockets.blogspot.com/2011/03/tec-accessories-tec-s3-glow-fob.html
http://keychainpockets.blogspot.com/2011/03/tec-accessories-tec-s3-glow-fob.html