This isn’t a forum on whether or not an egg-pattern, glo-bug, or whatever you want to call those small brightly-colored round things, is or isn’t a “fly”. What it is, is a solution to help you tie rounder small, brightly-colored round things.
The most critical tools for this pattern are:
1. Vise with very strong jaws,
2. Very strong thread (Uni-Thread’s Big Fly or Kevlar),
3. Sharp, tight scissors (crucial).
Without all three of the above, stick to whatever else you tie…you won’t like this “fly.”
The first step is to cut a bunch of 2” pieces of McFly Foam, whichever color is to be your main body color. You can then split each piece into many workable clumps of 2” long by ½” wide (when pressed flat) pieces. Now cut a few 2” pieces of whatever yoke-color McFly Foam you've chosen, and split away a number of very small 1/16th of an inch pieces. Lay a small yoke color strand in the middle of one of the body pieces. (You're best to do this to several so that you don't interrupt your tempo once you get going on these.)
Attach the thread to the hook and wrap back about 1/16th of an inch, and then back to just behind the hook-eye. Pull the bobbin up with your right hand. With your left hand, pull the yoke-strand piece of McFly Foam around the thread to form a “V”.
Pinch both ends of the foam between your left thumb and fore-finger and under tension, continue to wrap the bobbin down towards the eye of the hook whilst pulling UP on the foam. While still under tension (you’re seeing the need for strong thread), make a complete turn of thread around the shank of the hook. Now draw the foam down towards the top of the hook shank by pulling away on the bobbin. This is a pull and sinch thing…you’re pulling on the thread/bobbin and sinching the foam to the shank.
You’re now going to repeat step #3, only on the bottom of the hook shank. The key, here, is to NOT let up on the tension. Once you’ve sinched the bottom foam up to the hook shank, make 2 or 3 turns of thread just for added insurance. Whip finishing, with only 3 or 4 turns, is a bit tricky in that you’ll need to pull all the foam back with your left hand. A little practice and you’ll get it.
Cut the thread fairly tight, but you can leave a very slight tag (it will be hidden in the end). Now you’ll need to pull and tug all the foam to kinda form a “lion’s mane”. This will tighten up the foam and make a tighter finished bug.
Using both hands, in kind of a handing-off manner, pull all of the material over the eye of the hook, numerous times, to ensure that the foam is stretched and tight. Hold the material with your left hand (provided you are right-handed) and make one tight, clean cut. The closer your cut is to the hook’s eye, the smaller the bug.