Good information, Jay. Thanks. But don't confuse "eustachian" (a tube in the ear that connects the middle ear cavity with the nasopharynx) and "escutcheon" (e.g., a plate that surrounds a keyhole). The pins you used are "escutcheon pins".
OOPS! My bad. Thank you for trying to educate me - a challenging proposition - And you have possibly helped clear up confusion shared by many; unless of course I'm the only fly tyer who bumbles this one. Top of the day to you Kevin. JN