Or,

Skip the wing case altogether...

As a few mentioned, the 'flash' type of case is becoming a 'standard' for trout everyhwere. I just wrap one turn of 'flash' (pearl mylar type flat thread) through the thorax....no wing case and I get the benefit of the 'flash' from any direction.

Faster to tie. More durable. Simpler. At least as effective, maybe more so. Fish don't seem to care.

Of course, it's not 'traditional', it just works.

Buddy