I bought a ZI Super Ikonta 6x6mm which had the often mentioned "frame overlap" problem. I took the camera to Panorama Camera on 30th St in NYC for repair. When I picked it up, Fima explained that the winding mechanism was not broken but designed for a 120 film with different width of the paper backing. Fima made a gear that works with the width of the modern film. The camera works great, no overlap problem. Fima has also repaired my Welta folder and CLA'd my Contax II and IIa. I highly recommend Panorama!