What are the different types of pole pieces used on guitar and bass pickups?
There are many types of screws with many head designs. Some typical screw types are round head slotted, round head phillips, pan head, button head, fillister head slotted, fillister head phillips, headless slotted set screw, hex socket set screw. There are many types of Alnico rod magnets with different diameters and lengths. Carbon steel studs, bars, blades and rectangular shapes. Alnico or ceramic bar magnets can be used as pole pieces along with many combinations of each. Seth E. Lover designed the Fender bass and guitar humbucker using a machinable and threadable Cunife rod magnet that was slotted on one end and plated.