The wide flange plastic reels are easier for 120. However, the Paterson will work, just more finicky. As others have said, be sure they're clean, dry. When you load the film, grab the end that and pull it at least 1/2 way around the reel. Just be careful not to pull it out of the track. If the film jams 1/2 way through loading some times pulling the sides apart while winding can free up the film. Fuji film can be more of a problem as I think the film base must be thinner and the balls don't grab it as well.