This is not about tools for degaussing, it's about degaussing of tools when their magnetization is a nuisance.
It's common for files, drills, screwdrivers, ferrous workpieces, etc. to become slightly magnetized when used within the Earth's field.
Traditional demagnetizing protocol is to apply an alternating field, then gradually reduce its amplitude to zero.
For narrow parts, that can be done with an ordinary solenoid like this 120-V coil from an electrical contactor. Like most, it includes sheet metal yoke and pole pieces to concentrate the field inside the hole. Slots interrupt the two largest shorted turns.
With coil energized, I inserted the twist drill until its tip emerged on the other side. Then backed it out over a period of at least a dozen AC cycles. The swarf fell off with a gentle shake.
For posts specifically relating to fusor design, construction, and operation.
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