Hey Neal –
First of all, Y2Ks and egg patterns are tied kinda differently. The Y2K was invented by a dude in Fayetteville, Arkansas – I first saw it at a shop there called Ripple Outfitters that is now out of business. They were tying custom orders based on his pattern. Now it’s everywhere; kinda funny. I wish I could remember his name – I think he was a retired U of A professor.
Anyway, Y2Ks should be tied with Egg Yarn, rather sparse, on a delta cut. The method is similar to tying a standard egg pattern but the result is pretty different.
I won’t walk you through tying an egg step by step because you probably know it colder than I ever will. I’ve found that Kevlar thread and McFly Foam are key for getting quality egg patterns without much fuss. They can order you some McFlyFoam in the Fish Hawk. They have Kevlar there too – get the light colored, thin stuff.
The key to the egg pattern is to let the first hank of material slide around to the opposite side to lock before you place the second hank on. Tie both hanks on in the middle.