The best way to fixate an NX05 is either with the star-optics setup itself, or a holder of some sort, to keep the NX05 secure... You don't really want to epoxy the collimator directly to the LS itself, nor do you want to epoxy it to the lens or the sides of the flaslight body, per se, unless you feel comfortable with the connection strength of the soldered wires and with that light staying in that configuration for a long time...