Some glue it, others are using set screw sleeves like this:
http://uploads.tapatalk-cdn.com/20160331/0ad9538856fb12e23c76eff2db297b0f.jpg
Mystery Chunk and Sleeve Set Screw for Luke ROTJ V2 Anakin Starkiller Lightsaber
http://www.therpf.com/showthread.php?t=257460
ah HA! What I was going to do next was to attach the rod to the emitter and then just epoxy the rod in place. I might still do that...with the bearing on, my rod doesn't make it all the way to the set screws in the emitter :/