Hi. I use Paterson reels for 120 and usually manage to load without problems. Two things have been helpful. The first is bending back the leading edge of the film at around a quarter inch from the end. Bend it back against the curl to the point where you make a crease, then fold back. This is a trick I learned from another forum user, and it works very well. The second point is to avoid putting pressure on the side of the reels, ie don't push the flanges together. I actually pul them apart gently when rotating back and forth. These things work for me, but in Scotland I don't usually have to battle heat and humidity! I hope you find a solution. 120 shooting is very enjoyable. Alex