I am not well versed in tying extended body abdomens for mayflies. It requires special equipment and I have not bothered to explore the techniques. However, the uniqueness of the patterns and the drop hook is interesting and for those of you that are well versed in the how to’s of the extended body, the drop hook component may be an interesting experiment for you in your tying. The harware for extended bodies is either a tube fly technique or the side device that allows for tension on a core material which is overwrapped with the body material. The technique goes back several one hundred + years:
“I understood that this system was probably taken from a local 1800s tradition (the vertical hook) and then developed and perfectioned by Terenzio Zandri.”
http://www.upon-bamboo-fly-fishing-rods-and-reels.com/flytying-desks.html

Danilo Lazzarini’s Site (http://www.moschefacocchi.it/home_p.htm) The site is in Italian, but you can figure it out…the images are the inspiration to experiment.

Extended Body Techniques:
http://www.onlineflytyer.com/article_extendedspin.asp

http://web.thn.jp/dflyonly/Website/sub6.htm
‘tube fly construction’

