It seems that the beads etc on these flies are mainly being used as
"spacers". You can simply use another piece of tube, or any other beads for
this. Just a little tip, if you can get them "mother-of-pearl" or similar
"holographic" beads are often very effective on such things.

You can find practically any type of bead on the net. Here just a couple of
examples;
http://www.firemountaingems.com/plastic_beads.asp

http://www.thebeadery.com/beads.htm

http://www.china-accessories.com/bead/

http://www.dickblick.com/zz607/16/

http://www.creative-wholesale.com/Beads.htm

http://www.worthco.com/fish/fluorescent.html

TL
MC