KEH camera in Atlanta does repair/CLA work. They're somewhat pricey, though. There was a member here called "Greyhoundman" that did quality work on rangefinders at a reasonable price; rumor had it he's been ill & not doing as much lately. I remember coming up with a couple of places via internet search when I was looking for help, but can't vouch for any of them.
Sit tight, I'm sure there'll be more replies on the way. You might ask over at the Rangefinder forum, as well.