Here are some shots posted by DonaldN elsewhere


http://pic20.picturetrail.com/VOL170/17 ... 491351.jpg

http://pic20.picturetrail.com/VOL170/17 ... 491395.jpg

The method you describe sounds like the above may answer your question.
Another option is the similarly hackled Thorax dun by Vince Marinaro.

To get four turns on the Clyde style dry just figure8 the hackle twice.
It's impossible for me to explain here but try it- it does work- very well too.

Question, why make four turns, then overwrap and cut off the excess, ...
when you can make two wraps, overwrap with the tying silk, then tweak the hackle barbs into place.

This latter(Clyde style) method saves on time, hackle and saves wearing out your scissors..
Canny guys those Scotsmen.

Roy