Ted,

I have found the combination of teenage boys and subwoofers has created =
an abundant source of strong magnets for your type applicatiion.  We =
just had a junk day in town and speakers were plentiful.  If no junk day =
or neighbor boys then stop by an automotive sound shop and ask for some =
blown speakers.  The ring magnets are generally much larger ID than the =
visible gap so the gap can easily be cut out on a lathe or with a dremel =
tool and the post turned to fit your coil if need be. =20








Ted,
 
I have found the combination of teenage =
boys and=20
subwoofers has created an abundant source of strong magnets for your =
type=20
applicatiion.  We just had a junk day in town and speakers were=20
plentiful.  If no junk day or neighbor boys then stop by an =
automotive=20
sound shop and ask for some blown speakers.  The ring magnets are =
generally=20
much larger ID than the visible gap so the gap can easily be cut out on =
a lathe=20
or with a dremel tool and the post turned to fit your coil if need =
be. =20

 
Randy