Ben Bent (from Favorite Flies and Their Histories by Mary Orvis Marbury)

a 1884 Charles Orvis fly

Hook: #12 dry
Thread: first yellow, then red
Tag: gold tinsel, yellow and red thread
Tail: two very small light dun feathers or feather tips
Body: light gray wool
Hackle: oversize light dun dry
Wings: light dun feather tips
Head: red thread

Head cement recipe:
Goop
Xylene (epoxy thinnner)

Instructions:
Fill a quart jar half full with Xylene
Squeeze a tube of Goop into the Xylene
Shake until the Goop is dissolved; add Xylene to desired consistency

Apply with a pin or needle dipped in the liquid

https://youtu.be/AJbvJUixaCs