Hi all, Potentially a weird question, but are some 120 films (well, films + backing paper I guess) thicker than others? I've just started shooting through a box of Foma 100 in my GF670, and I have noticed that towards the end of the roll, it gets harder and harder to wind - by the last two or three frames, I have to apply about as much force as I can muster just to wind it on... to the point that I am worried about breaking something. I've shot about seven or eight different types of film through it, and never had a problem. Am I just being paranoid and overprotective of my baby (she is so pretty and sleek, but with retro charm!), or is there actually an issue at play here?