That Uni Stretch is easy to source and you can use it for doing a lot of different things on flies since it's nylon-based. I use it mostly in white. Here's a link that will get it to you in under a week:
Yup, you need a good saddle. You should pick it out yourself because not all saddles are created equal. Ideally, you want a Rangeley streamer saddle; one where the feathers are a little on the limp side. The limpness lets the feather "hang" just a little, which is what you want in most of these patterns. It's the main reason that you need 4 feathers to form the wing. The limper feathers are more translucent than opaque. To get a nice white wing, you need the combination of the 4 feathers.
You also want a saddle that has a clear curvature on both sides; the feathers on both the left and right sides curving in slightly toward the center. Sounds hard to source, but it's really not. Most stores that carry fly tying materials will let you take the saddle out of its plastic cover and examine it closely before you plunk your money down. I source them from www.feathermc.com
I'd give you a direct link to the saddles, but their site seems slow to open this morning; maybe they're working on it.................
Woops! He's out of them; looks like for the long term:
I'll see what I can dig up and get back to you on them. I've used Whiting American rooster saddles before and they also work well.
Unfortunately, as you'll read, you're now competing with the hair extension crowd and it looks like they're winning!
The orange spot at the tip is supposed to imitate the eye. But, a lot of tyers like to show more of the JC nail, so both the orange and the white spots tend to be seen on most patterns today. Historically, you only saw the orange tip spot most of the time.
The angle of your first wrap of tinsel pretty much determines the angle of all of the others as you wind your tinsel up toward the head. So, if you want it sparser, then start your first wrap at a shallower angle. Also, with a less pronounced cigar-shaped body, there will be less of a tendency for the tinsel to want to slide. One more thing, keep the pressure on the tinsel until you have it tied off at the head. Otherwise, it will slip on you. So, keep the angle constant and keep the tension on until you've got that part of the tie completed. Those points should tame the show hog for you.
Good luck, we're all looking forward to your next tie!
Happy Easter everybody!