I've got an easier way. When making your hooks with the baitloop many fisherman like to use 15 to 20 wraps. That enables the hook to hold more bait. When throwing a corky/yarn setup, reduce your initial wraps to 6 or 7. Open the egg loop and put a piece of yarn about an inch long through. That leaves one half inch hanging from the knot on the hook. It stays on real well and you rarely have to tamper with it. But remember, keep your yarn well trimmed and don't let it hang any lower than the bottom of your hook. That way when the fish hits, he'll hit your hook and not just your yarn. I can't even count all of the guys I've seen throwing yarn that hung a full inch below their hook. They wonder why they don't hook fish. For one, their probably spooking the poor things. Secondly, if the fish bites, all it's getting is the yarn. Best of luck. This is the same setup I've used for years. Works great. THE LESS YARN THE BETTER!
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Another patient exhibiting symptoms of the steelhead virus.