A Site Dedicated to all enthusiasts of Classic Style Banjo
These were developed by Vega for the proposed Boing-A-Phone banjo. The prototypes were disappointing and the model never went into production. Vega sold the coils to Clifford Essex at a loss.
Makes sense to me !
I am going to say that they are alloy testers. Each spring is a secret Gibson formula of brass.
There are still people selling magical tone enhancers. At least this look like something, the ones on the market today are either a folded piece of brass foil or a piece of card stock with some bits of metal taped on.
Is there any clue how they are fitted?
How they were fitted? The right earlobe of the player was pierced as if for earrings. The end of the coil was pushed into the hole and the coil dangled from the lobe. The same was done to one earlobe of each audience member. It was all the rage. Coil wearers were known as "sproingsters"
Oh, I see... You have to pay $1.25 and then they will tell you how they work.
Or maybe the answer can be found somewhere in this video:
I'm thinking that the ones that did not sell were reused for these...
BTW, as a fan of historical banjo nonsense products I would love to have a set of these springs for a curio box. It would go great with my Grover Tone Ring, Vibrator, Iucci Tone Ring, and countless mutes including the Hartnett Lever Mute.