The plastic
Paterson type of spool can be difficult to load. A common problem
is the little metal balls that grip the film get stuck. Dont try to
force the film through, if you do it will kink the negative leaving a
half-moon shape. It can make the frame(s) useless. You will need to
part the spiral and start again. A pain I know! Be gentle when
removing the film, there is a chance of damage.
Damp or wet spool
will not load, so make sure it is completely dry before use. Sweaty,
damp or sticky fingers will make it difficult as well.
A too tightly
rolled up 35mm film in its cassette can take a set that makes it
tricky to load. So when rewinding the film back into the case dont
over wind it after you hear it has released itself from the camera
spool. With practice it is possible to leave a little bit of the
leader poking out.