This was originally built for salmon fishing, but I have caught loads of species on it.
http://globalflyfisher.com/patterns/hka-sunray-bismo/ (http://globalflyfisher.com/patterns/hka-sunray-bismo/)
Also very robust. I just use q-tips tubes, weighted if desired. I use a fairly special system/trick for weighting these flies, I will add something about that later as I need a few photos to do it.
For some general info on tubes;
http://www.file-upload.net/download-4009940/Tubes.exe.html (http://www.file-upload.net/download-4009940/Tubes.exe.html) ( This is one of my old e-books, should run on any Windows platform).
TL
MC