I have been playing around with spiral flu flu's and found a way that works great. I can make pretty good ones with glue, but messy and time consuming. Take your fletch tape and put it on the arrow shaft that you are using for the flu flu. Space out the spiral down the shaft. I start mine one inch from the nock and go down five inches.
Now to make this work and hold up, you have to use stripped feathers. Ground are too stiff for the tape to hold tight. Start at the top,nock end, and thin end of the feather, lay it on the tape and start wrapping it onto the tape on the shaft. I tried putting it on the feather,,,,,trust me....not good. Wrap the feather all the way to the end and you have a flu flu that looks good and will hold up and takes about 3 mins to make one,,,after you have the feathers prepped.