Here's Roop's swap fly, in his own words:
Roop's Pike Fly
This one comes with no guarantees. Just a combination of studying and trying to combine lightweight/ castable, bulky, bright, and shiny. I'm embarrassed to say that after I started this I realized it was going to look like something that fell out of Ronald McDonald's fly box. You want fries with that?
Hook: 1/0 Daiichi stainless steel
Thread: Clear mono
Belly/spreader: Mike Martinek's fibers, pearl
Wing: Icelandic Sheep fur
Head: Coastal deer belly
The only thing special about tying this is using Mike's fibers for the spreader. I pull off/ out a clump, pinching it in the middle I straighten out the fibers, double them up once or twice, tie in and glue at the rear of the hook. I then pick out the fibers for a tail with a dubbing needle.
email me if you want Mike's number to order this stuff.