Often unfairly derided by purists, these little humbuckers produce a powerful tone with more focus and clarity than a standard humbucker.
Two thin narrow bobbins, packed with hand-wound wire coils over a bar magnet. One with the little screws, the other with a chunky bar of steel - its not designed like a normal humbucker and doesn't sound like one either. Slightly mismatched coils produce a clear aggressive tone with a broad sonic spectrum. Versatile and responsive enough for all types of music.
Fletcher Minis are Modern size and might not fit well within vintage guitars:
Dimensions - 68mm(L - 80mm including mounts) x 28mm (W) x 16.5mm ( H - 26mm including mounts)