The new film leader is pulled until there is just enough to slide the end tab
into the take-up spool. If there is a difference in the slots in the spool, start through
the longer/wider one. Push the spool flanges around enough to engage the paper tab
so it can't pull out. Slide the camera works into the box until the release catch engages.
Turn the winding knob counter-clockwise, pushing in to engage it. Wind until the number 1
shows in the red window at the back of the case and you're ready to take a picture.