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Bill makes a good point wrt the cone error...you can see how much you're may be when you've drift aligned on one side of the meridian, then flipping it to the other side. With any luck, the difference will be negligible.
Btw, another technique to consider raymo when drift aligning is the DARV method. You'll find much better descriptions in a Google search but essentially you start your camera running (say) a 30 second exposure and slew your scope west for 15 seconds followed by 15 seconds going east (or vice versa). When you are polar aligned, the star trails will be lines...i.e. the Stars have retraced their steps when the slewing is reversed. If your polar alignment is off, you'll get a V-shape. You need to do this both near the horizon and meridian to highlight the error in altitude/azimuth as with conventional drift alignment of course.
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