Green Mountain Audio

Get in touch with the Speaker Exchange in Tampa, they can reform the drivers. They have done excellent work for me on JBL and Tannoy drivers. 

Congrats on the speakers. Over the years I owned Imagos, Callistos and Continuum C3. All were excellent performers. Roy was a true genius in my book and a real gentleman.

Most bigger cities that I know of have PROFESSIONALs that are skilled at rebuilding drivers—everything from new surrounds to new cones and even coils. This might not be the exact same quality speaker that was in it originally when you are done but you actually take the chance on improving them with new modern materials and compounds being used. Do your research first and even get references. You might want to go the extra 100 miles to get a better tech to do the right job.

My buddy Dale was friends with Roy, who did pass on. Dale knows a TON about Green Mountain Audio products and I sent him the link to this thread. Before you do anything wait to see if he has any advice. 

A local dealer has drivers re-foamed all the time.  He has a tech that can do it, but, it takes the tech hours to do a pair, while the place they use charges $50 to do the job.  The commercial operations can even do extremely delicate work, like replacing the surround on Lowther drivers, some can re-cone and replace spiders.