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When you do your drift alignment the parameter that is being tested is the dec drift (North south). The first step is to drift around the zenith adjusting only the east/west azimuth angle of your wedge. Ignore any cyclic E/W drift just make sure there is no N/S drift.
Next you do the same test with stars at the East and west horizon and adjust only the Altitude of your wedge. Once again ignore the cyclic E/W movement.
Repeat these steps til there is no drift anywhere in the N/S plane.
Now you can look at the E/W drift. If it is cyclic and returns to the same position every few minutes it will be PEC. If it does not return to exactly the same position there will be another problem as well as PEC. could be backlash, flexure, balance etc.
Barry
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