moving swiftly on the custom made Jig can be mounted and the upper screws tightened on the ferrite magnet to hold it securely, centred roughly in the middle with the lower set of screws resting on the top of the magnet, then turning everything upside down and viewing the core position through the dust cap aperture the lower screws can be adjusted to centre the core within the coil, this can take 10mins or so as it involves adjusting a screw and its opposite screw to effect the balance.
I have tried the other method using thin strips of card inserted into the coil to centre the core without much, if any, success....my thinking was that speaker manufacturers wouldn't use bits of card to do this so there had to be a better way.
I have tried the other method using thin strips of card inserted into the coil to centre the core without much, if any, success....my thinking was that speaker manufacturers wouldn't use bits of card to do this so there had to be a better way.
