There's a local fly shop owner and tyer that has a new Umpqua pattern he calls Chocklett's Disc Head Slider. You can see it on his web site, [url=http://www.blueridgeflyfishers.com:1895e]www.blueridgeflyfishers.com[/url:1895e]
look under fly tying. I was in his shop the other day, its a pretty cool pattern. He uses steel punches to make the discs and I believe he uses zapagap to glue them 1 up 1 down along the hook shank, although I could be wrong! hehe not 100% sure exactly how he ties it