[Groundhog74]

I recently acquired a 512 Mandarin with the matching 211 speaker. The original coil/driver assy is dead. Coil is open and pot metal swollen and crumbling. 

I have removed the original guts and installed a modern PM speaker with an impedance matching transformer, but would like to keep it all original if possible. 

My first question is, can the pot metal sections be removed and replaced with something else.
Would the replacement have to be metal, or would some other material suffice?

Second, what type coil is needed for replacement of the open coil?

Has anyone tried this? 

Thanks for any help in advance.