I've had great success with my M3 as well as other rangefinder and slr lenses and cameras at Essex Camera (aka Camera Repair.com) located in Essex NJ. They are competent and knowledgeable and very easy to deal with. Turnaround time is about 2 to 3 weeks tops. Here's their link: http://www.camerarepair.com/leica_camera_repair.php . Also try Youxin Ye http://www.yyecamera.com/ People who have used him love him. Good luck!