My standard boards are designed to fit the US-made Vox V847 and drop-in without soldering. They can also be fitted to Vox V848 Clyde McCoy, Dunlop Crybaby and Jimi Hendrix wahs with some wiring mods. They will not fit the new Chinese-made Vox V847A, the mounting bosses and wiring connections differ from the US-made wahs.
My standard inductor is a hand-wound replica of the halo inductors found in early Vox wahs. I can also wind custom inductors on request e.g. Colorsound or grey JMI Vox wah specs.
Halo inductors were used in the first Italian-made Vox wahs, notably the Clyde McCoy. There were a few different types of halo inductor; mine are based on a variant that is most commonly found in the "Signature" Clyde McCoy. These inductors are only available on replacement boards or in wah rebuilds from me or Tom Lanik at North Star Audio. I no longer sell inductors separately and I do not supply any other manufacturers.
Original halo (left), replica halo (right)