Rhody,
I used the quill from a peacock eye. The reason I like this quill is the size. The eye's have finer quills for small flies.
If your splitting quills while wrapping them, try soaking them in tepid water. This makes them more pliable and less prone to breaking.
On this particular pattern, I used the last third of the quill section, the wider end. This end can take more tension while wrapping then the thinner or tip end.
I also coated these fly, but didn't for the picture. I tried some thing new, super glue. It drys fast, but you have to very careful while applying it. I used a pin feed bottle, and was able to control the flow of the liquid glue.
I like to also coat fly's with Griff's fly tyeing multi coat. it also dry's fast and is very thin, not messy at all.
On this size fly, I use a lighted magnifying light, to see each wrap, and try to wrap them touching, or a slight overlap to get the stripe of the quill edge, that gives the fly a rib look.
When you buy stripped quills, sometimes they are not completely stripped, you can fix this by using a pencil eraser, and your pulling the quill between your finger nails. This cleans off the fuzzy fibers.
Hope this helps
TP