The selector switch shaft should have two flat spots so each of the 5 wafers are either right or wrong (as you noted). To align the two wafers, you would need to remove the shaft then rotate the misaligned wafers 180 degrees then reinsert the shaft. If the 2270 is like other models, the schematic will show the wafers contacts in the CCW selector switch position (AM) so if you select this, the wipers should look exactly like the schematic (assuming no error in the schematic).The selector switch on my 2270 has three wafers (the rotary part) wrong and two correct.