From The Vise By Brad Berlin

ESTAZ EGG SACK

HOOK - Mustad 37132 or equivalent Size 10/8/6/4
THREAD - Monofil 004
WEIGHTED - Tungsten or gold/black bead head
BODY - Estaz
EGG SACK - Dyed Pearl Diamond Braid

TYING INSTRUCTIONS
Wrap mono to rear of hook.
Tie in Estaz and make one wrap and let hang.
Tie in the Diamond Braid on top of the hook.
Make a small loop with the Diamond Braid and secure with one wrap of mono.
Repeat last step 3 or 4 times. Do not make the loops too big and keep them close together. Remember you're imitating an egg sack. Stagger the loops, one on top, one to the left, one to the right and so on.
Tie off the last loop and secure.
Bring the Estaz you left hanging under the egg loops and make 2 or 3 wraps in front of the egg loops toward the eye. Remember not to crowd the eye.
Tie off and secure.
Note: If you want to weight this fly, you can use a tungsten or lead bead head.

I used Blue Estaz and Pink Diamond Braid for the pictured fly. Estaz comes in every color imaginable.
The Diamond Braid comes in pink, salmon and chartreuse. I'm sure they have other colors available, but these are the colors I have seen and used. Try different color combinations like pink Estaz and chartreuse Diamond Braid. I know I have said this before, but experiment with different color combinations and then pick the ones that produce the fish. Like the original Estaz Egg, this one works for browns, steelhead, salmon and trout.
Fish it the same as the Estaz Egg. Get your weight right so the egg is rolling along or just off the bottom. The most important key to fishing egg patterns effectively is a drag-free drift. Your line should follow the current or flow. Add or remove weight on your leader to achieve a drag-free drift. Once you get the drift right, any time your line hesitates, stops or moves differently, set the hook.
The slightest hesitation of your line on the water could be a strike from that trophy fish you have been searching for. Remember, get the egg down and rolling along the bottom with a drag-free drift. Once you get the hang of it you will increase your fish catching average by, well, I better not estimate that one.
This variation to the original Estaz Egg just might get that fish not eager to take the Estaz Egg he has seen pass him by 1000 times before. This gives them something different to look at.
It's a very simple fly to tie after you get the hang of making the loops and tying them off. So add some to your egg box and when the Estaz Egg isn't producing, tie on one of these and give them a try.

Tight lines,
Brad Berlin