I always had problems loading 120 onto dry Paterson spirals until I started cutting the corners off the film - they used to catch on the radial bits of the spiral. Also I found the curl in the film made it very difficult to get it properly located in the mouth of the spiral until I sorted that by cutting a piece of old printing paper to use as a guide.

If you've not had these problems that's great, but they (and the same basic solutions) crop up over and over again on forums, so lots of other people certainly have experienced them. Maybe some reels are just better than others?