About four years ago I inherited a prewar Zeiss Ikonta 6 x 9 in beautiful condition except the shutter was frozen from sitting in a drawer for probably 50 or more years. I sent it to Midwest Camera Repair in Wyandotte, MI:http://www.midwestcamera.com They did a nice job CLA the shutter mechanism for about $100. I hardly use the camera, but it works perfectly (used only in mild weather conditions.) I have used them successfully for other repairs over the years.