I bought some tungsten thread to try out this past fall,here is a fly I've tried it on. You can really whack on the weight in a small area with this stuff. Great for those of you who want a lot of weight without a bead.
Hook: Daiichi 1120 #6
Body: Sybai flash nymph dubbing rusty orange
Thorax: Slf spikey squirrel dubbing dark brown
Rib: Ultra wire brown
Back: Siman magic shrimp foil
Weight: Tungsten thread that weighs between a 1/8-5/32 tungsten bead ( closer to 5/32
Here is what that amount of weight looks like on the bare hook
I put it on a bobbin to wrap it on. I used the "fine" size on this size hook, the other is x fine and it's the size of a hair actually much smaller which would make it ideal for much smaller hooks. One thing I found like thread it builds twist as you wind, so about every two dozen or so wraps I'd let it hang and unwind. I like this a lot and I'm going to incorporate this into a lot of nymphs.
This nymph worked so well through the fall/winter that I got some other colors and tied them. What I've found is as the season progresses different colors become effective when they were not earlier. The smaller one in the box are size 12 and are weighted to a 7/64 tungsten bead.
These patterns will get you to the bottom and keep you in the zone. If you've been looking for an alternative way to get weight in your patterns ( patterns you don't like the looks of a bead on )I think the tungsten thread could work well for you, it absolutely has for me.