Not sure if it was mentioned yet but a good substitution for jungle cock eyes can be fashioned out of a natural guinea fowl feather. Dick Talleur mentions this in his book "Pretty and Practical Salmon Flies". A single dotted guinea fowl feather can be cut (or "burned" out using a tool) into shape with the quill running down the center. Make sure one of the dots are in this cut-out tho

-Logan