Take it to Essex Camera in NJ (camerarepair.com) Very reputable, they have repaired my Leica's, replaced the bellows on my Fuji and done CLA's on my Mamiya 645 equipment. Fast & trustworthy. You might also consider just getting another lens on e bay or KEH. If the lens your talking about is from the first Mamiyaflex twin lens, maybe it's time to upgrade. Good luck!