Re: Dorsey's mercury midge
I use white brass beads for some patterns (ice cream cones, etc), but if you're thinking of using a tungsten, I know Montana Fly has Lucent Beads in a bunch of colors, and they run down into the 1/16" size, which is perfect for size 20 and smaller hooks.
Now if you're wanting to drift a little sparkle on the back of a tungsten bead, try this:
thread a strand of small flash or tinsel through the eye of the bead before you put the fly on the hook
then put bead on hook
pull flash back over bead and tie your fly
This creates some of the 'shine' you get from the metal or silver lined glass beads that make the mercury midge sparkle.
If you're really good with nail polish, an opalescent pale color and a very steady hand can also do the trick. If you're not wanting to paint your whole fly (some of us with clumsy fingers have done such a thing(, use a sewing needle or straight pin held in a pair of hemostats as a mandrel, and plop your bead on and paint, let dry, and tie. Or dot it on the bead after you've tied your fly if you have very steady hands
More importantly, SET THE HOOK!
I still say he married me because he took me ice fishing and I still wanted to go fishing with him again!