Ricoh D131 Service Manual page 1487

Replacement and Adjustment
4. Remove the Set screw.
5. Turn the Adjustment screw to do the adjustment for the stopper.
1st, 3rd Stopper
Turn the Adjustment screw clockwise to lower the front end of the fence.
-or-
Turn the Adjustment screw counter-clockwise to raise the front of the fence.
2nd Stopper
Turn the Adjustment screw clockwise to raise the front end of the fence.
-or-
Turn the Adjustment screw counter-clockwise to lower the front of the fence.
D454/D615 94 SM