I've had great luck on speaker rebuilds with
Gordon (Gordy) Kjellberg
8116 10th Ave SW
Seattle, Wa. 98106
PH# (206) 763-1519
no email
Gordy is recommended on the http://www.webervst.com site, that's how I found him. He does EXCELLENT work, only negative he takes a while but it''s worth it. He's low priced enough that even with shipping you'll be hard pressed to beat his price. He works with vintage naterials. He recently reconed 2 15inch Sunn Magnas that I bought form MikeL on this site and are they ever nice now. You want custom OHMS, he can do it. Best time to call Gordy is before 9AM Pacific or leave him a message, his day job is a piano tuner. Also tell him that Brian COmnes sent you, (hey no kick backs here just good will...).
You WON'T be disappointed.
Brian