When I first got my G11, the polar scope was not well-calibrated, and as a result, I was building a model to improve go-to accuracy. Once I calibrated the polar scope, I found I merely had to do a 1-star alignment and my go-to was just fine for my visual observing.
You do need a 0.9mm Allen wrench to adjust those tiny grub screws. I could not find that at my local hardware store and had to order from McMaster-Carr (which kind of stung because there is a minimum shipping charge). Be very careful not to exert any pressure on the glass reticle because it will shatter - use very gentle fingertip pressure and be sure to loosen 1 or 2 screws before tightening the opposing one. I found it was really quite easy and quick to get it nicely calibrated, but just be careful not to exert pressure on the reticle.
-Bill
