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A lot of the instructions for polar alignment say that drift in RA is only caused by an innaccurate drive. This is wrong. RA drift can also occur when your polar alignment is off and it then looks like your motor is going at the wrong rate. If you are on the meridian and have no drift in dec, but your polar axis it too low, it will look like your motor is going slightly too fast and if your axis is too high it will look like your motor is going slightly too slowly. So you have to drift align very carefully in both altitude and azimuth several times until there is no dec drift as you go from horizon to meridian before you start worrying about your drive rate. Of course, it's possible that your drive rate is wrong. In this case I would check overtight meshing between worm and wheel.
Geoff
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