When the trout have worn out the peacock herl with their teeth and the fly may look a little the worse for wear, don't throw it away. Put it in your hat band for this special occasion...
During any of the 1 to 2 hour blizzards of Caenis making their presence felt, a lot is going on at once. The nymphs are emerging, the duns are hatching, swirls of Caenis spinners are mating in the air over the water and nearby, as fast as they can and... the spinners are coming back to the water. It is a swirling chaos of activity. The fish are rising and many anglers are beaten into believing that Caenis do not present a reasonable opportunity for success. Even if you could tie a perfect fake on a size 26 hook, why would the trout eat your single offering when there are so many real ones? Yours would be hopelessly lost. Persevere by all means with this approach but you will be hoping for a dumb fluke of a chance. But there is a way that gives you a real chance. In fact it gives you many, very good chances.
Here's how to make the Double Badger:
Here's the hackle almost tied in, two more turns to go
Wind the hackle back to the thread and then wind the thread through the hackle tying it in securely
Now tie in a strand of peacock herl immediately in front of this aft hackle
Leave the thread dangling where you tied in the peacock herl and wind a body by close turns of the herl up to the front and then back again to the thread and tie in the herl
Rib the herl with open turns of the thread up to the front of the body and make a tiny bed for the front hackle
Tie in the front hackle taking the thread back to the front of the body and making a bed for the hackle turns as you go
Wind the hackle and tie it in taking the thread through the hackle to make a whip finish just against the eye, varnish the whip finish with clear nail polish, clean out the eye of the hook whilst the varnish is still wet (the left-over, hackle point, from your hackle pliers, makes a good pull-through) and there you have it - The Double Badger!
You can read about the inventing of the Double Badger in Angling with the Fly by J N Watson.