Replacing a field coil type speaker.

[Refugee]

An old cordless power screwdriver run from a bench power supply will be even better if you have got one with a duff battery laying about. You get enough torque for winding coils from an amp or two.
I have got an 18 volt power tool that had a duff battery connected up ti a 17AH dryfit for those jobs that just drain the supplied batteries.