Samigon reels are much easier to load, they are available from B & H.
One problem that I didn't see mentioned above - if the film curls up a little, it may go under the point where the film first enters the reel when it makes the first pass around the reel. If the film is thin, it may be able to 'double up', two layers of film going around in the same slot.
To prevent that, keep your thumb under the film at the point where it is being taken up by the reel, and wait until you feel the leader coming around the first time - make sure it does not go under the film being pulled into the reel.
Randy