I removed mine from my stellervue eyepiece here
http://www.stellarvue.com/eyepieces.html
from memory the crosshairs ,red thread or something stuck on a piece of glass sits in a little slot in the adapter ring you can see on the eyepiece there, the illuminater when threaded in shines through the side of the bit of glass not above or below .
I may have the illuminater rolling round someplace if you want it .