Step 10: What to do if you can't obtain a crystal?
If you can't find a suitable crystal, you can try the plastic tubes that florists use to keep single roses fresh. The tube will rest on the inside of the pipe on the nut in the same way as the crystal. If you get a used tube, as I did, don't fret if you can't get the tube to be super clean and spotless - the scratches and imperfections add to the effect. The tube has an interesting effect similar in appearance to neon lights and reminiscent of the days of early experimentation with electricity and vacuum tubes.