I present my "Twisted Hex" tritium decorative bead, designed to take six 2x6mm tritium vials (tritium vials not included).
The bead is designed to screw onto Pandora bracelets, which prevents it slipping off, when the bracelet is undone. The bead has a short threaded section; in the centre of the main hole.
The tritium vials should be set using a UV activated optically clear adhesive such as Norland 61 or Loctite glass bond. These adhesives will cure in direct sunlight in an hour or so.
There are some more photos of this object and other examples of my work, both 3D printed and otherwise, on my 'Tofty' facebook page.