Canon Puncher Unit-BS1 Service Manual page 37

1. Push the claw in the direction of the arrow [A] and remove the 3 knobs in the direction of the arrow [B].
CAUTION:
Be careful not to drop the bearing inside the knob.
CAUTION:
• If the bearing fell off from the knob, reattach it.
• A bearing has the orientation so make sure to install it in the correct direction.
Bearing
[B]
[A]
Knobs
With inscription
33
Claw
No inscription
4. Installation