Warren, thanks for this week’s fly…just by coincidence, yesterday, I was doing some filing and came on the article you mention that I had torn out and saved…Thanks, it will be more meaningful for me now 
what did you cut the slit in the body with?
Something sharp? :roll:
I use a razor blade to do mine, but, you could use just about anything that is sharp. The foam is not that difficult to cut. Just make sure to stay in the center of the foam. For the angle, I use my tying sissors. What angle is not as important as making sure that it starts at the hook point or before the hook point. If not, it will prevent hook ups since it will make the gap of the hook too narrow.
tied up a 1/2 dozen already
Warm Water Fly Fisher,
You gonna love fishing with them! 
If the fish pull the legs out of them, they will still catch fish. After you get home it only takes a minute to put new legs back on. I have even tied the rubber legs in on the sides rather than going through the body and the popper still works great. When you fish them and there is any current at all, just let the popper float along with the current and when you least expect it, a fish will just blow up on it! They are a blast! If there is no current at all, you could give it a little twitch. I think the legs moving naturally in the water is what triggers the strike. Sam always told me to just put it out there and sit back and lite my pipe and do nothing else.
Hope you enjoy them as much as I do.
have you glued the legs so they don’t come out? also about how longdo you make the legs? I can’t wait i can get them wet
I make the legs on mine about 3/4" to 1" long. You can put a drop of glue at the base of each leg where they enter the foam or after you have the legs cut to size, you pull one side out about 1/8" and add a small drop of glue and then pull the leg back to the original position. This will pull glue into the foam. You can also tie the legs on the sides instead of going through the body. Going through the body is the way Sam always done his. I find the popper works either way.
Warren, what kind of glue do you use…sounds like a worthless question but I have made an observation about the cyanoacrylate that I may mention in a new thread.
WWFF
I took a class at Tennessee Valley Fly Fishers when I started tying and Sam showed us how to tie the One Bug. He gave us all a blade that was made for wall paper strippers to cut the foam with. He was a fine man and flyfisher.
Knucks
On one of my dental lab visits I mentioned to the lab owner about what type of glue the lab used for their dental work and he showed me what they use and gave me a bottle of it. It really does a great and fast job of gluing the body together. I do not use it on the rubber legs because it kinda melts them. On the rubber legs I just use Sally Hansen. The glue the lab gave me contains cyanoacrylate. It states on the bottle that it is super fast curing and has penetrating action. It does dry very quickly and is super strong. You do not have hardly any time to position the foam body before it sets.
I also tie the rubber legs on the sides of the foam and this eliminates any problems with the legs being pulled out by the fish. Replacing the legs is really the only maintenance item on this popper. It is very durable.
Great to see all the info on the One Bug! As for cutting. The best tool is a singled edge razor blade. There are several styles out there that have a lip on one side to be able to hold while cutting. Crucial to only cut 1/3 of way down and to keep the hook in the lower third of the fly so it rides better in the water.
As for glue. Dental Lab glue works best as mentioned. But it dry’s very fast. Great for production tying. Gap a Zap works just as well. But dental lab glue is 6 times the size bottle and half the price. Super glue will work in a pinch. Be cautious when closing the gap. I highly recommend using a clamp type tool that is self closing to hold while drying. instead of fingers they are kinda hard to fish with when they are stuck to the end of your index finger. Trust me from experience lol!
Waders
i figured it out now, and tied a few more. when i was cutting it was sort of tearing and not getting a smooth edge so it wasn’t easy to glue together. now i got it. easy tie, awesome fly