Many thanks! VF101, I crunched the sprocket holes on this first roll too, ultramax 400. I opened the back and it seems to work when I seated the sprocket hole fully on the little tooth on the takeup spool. I started at shot 5. I can't open it to check if this is true now, but I read somewhere that the toothed wheel doesn't advance the film as in other cameras, it's the takeup that does the pulling and the toothed wheel just spins along. If that's true it seems to me the position on the takeup would be important because it would set the distance between the held sprocket hole and the teeth on the wheel. Thanks again everyone!