ksb,
I had my 10" woofer for my VMPS RM40s refoamed with a new cone that looks identical to the other woofers except newer for a reasonable cost at Deltronics in Woodridge, IL. Phone number is (630) 910-6630. They do work on anything including vintage tube equipment and really old stuff. They have fixed a sub for me along with the VMPS woofer, TRL DUDE preamp, Oppo 83 cd/DVD player, and advised me not to fix a couple items that would not have been worth it even though they would have made good money doing the fix. Everything has worked fine since. They could fix your woofer. If you don't find a place close to you that can do it, they are plenty able. Located about 25 miles SW of Chicago.