You could try Nippon photo clinic, they are near the flatiron district. Though no promises, they do a large amount of work on cameras, but their service has been slipping. I took in a pair of rangefinders, and after a week said they wouldnt CLA them because of age. 1-2 day evaluation turned into a week, and would have been longer if I didnt call them on it. You might as well send it to Essex which I hear is good, but have never tried. A bit wary of mailing my items, but I might have to drive up there sometime.