Ricoh D131 Service Manual page 94

Punch Units (B531/A812)
9. Install the sensor arm [A] (

Make sure that the sensor arm swings freely on the step screw.
10. Attach the spring [B].
11. At the rear, position the 2 mm spacer [A] and attach the punch unit [B] (

At the hole just above the lock lever, use one of the screws from the paper guide
removed above to fasten the remaining two spacers to the frame.

These extra spacers are used to adjust the horizontal position of the punch holes.
D131/D132/D133
x 1, small step screw (M3 x 4).
2-50
x 2, M4 x 10).
SM