[Arran]

I hope he will, he did not claim it was working....

Mike, The guy responded that he was unable to test the speaker so he sold it as-is. Well, I checked his other auctions and he has several radio related items listed, that tells me he must have some knowledge about this sort of thing. So I just don't believe his story. I think he had tested the speaker and was dumping it on Ebay.
Other Mike, I have been studying the pictures of your winding machine, I will have to make one. A pulse width speed control would work much better. I also need to build some sort of fixture to press out the pole piece. I'm not sure if I want to use a hydraulic jack or just a large bolt.
Steve

 Pressing out the pole piece is the easy part, pressing it back in so its straight is another matter, though not too difficult with a proper press. I can't imagine that they needed much force to press them together but who knows, at least they didn't weld them in too like an RCA speaker.
  I think that if it is a universal style brush motor you could probably limit the voltage to control the speed, like with a variac. For an AC only motor that involves using a variable frequency drive, which is out of the question for this sort of thing. A fellow on you tube used a cordless drill, which has a speed control built in, with gears I think, and rigged up a counter to count the number of turns, it usually is not a problem finding a good cordless drill to butcher for this, most people toss them out after the battery dies.
Regards
Arran