Canon V - Manual (Page 12)

Any standard 35mm film cartridge will fit the Model V.
Slide the Rewind Knob Release Lever (24) in the direction shown
by the arrow. The film Rewind Knob (23) will spring up part way.
draw it up fully to facilitate turning.
To open the camera, press down on the Lock for Hinged Back
(34) and the camera will swing open.
Rotate the Take-Up Spool (36) until the groove on the spool
permits you to slide the end of the film leader into the groove and
engage the second sprocket hole of the leader with the small hook
inside the groove. Adjust the film so that the film sprocket holes fit
the teeth of the Film Roller (37).
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