Canon A-1 Instructions Manual page 27

rewind crank clockwise to take up film
slack, open the back cover and reload the
film.
The A-1 can also be loaded with bulk film in
which case the tip of the film should be
trimmed as illustrated below before it is
loaded into the camera.
DODO O
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Before loading the film, remove the plastic
insert from the pressure plate, and throw
it away.