I successfully used the suns shadow to polar align my scope. firstly, if you ask the sydney observatory very nicely on
observatory@phm.gov.au. They can provide you with the times for a couple of days when the sun hits the north position. eg, July 29 at 11.46am the sun was perfectly north. You then hold a string or a pole at the top so it swings freely, and use the shadow cast over the body of your eq mount making sure it lines up. I was able to get my scope (at the above date) to align so well, the the object at night stayed in the field of view for hours.