I saw a stainless steel or aluminum version of this fascinating toy on another website.Superb design & workmanship on a traditionally shapped plug that was ~ 1.5 " thick at mid point, tapered tip and base and had an external tuning fork. Think of the vibes ! The owner could not recall the sources. I'm wondering if anyone else has seen this and what is your experience with it? If yes, where can it be purchased ?