Originally Posted by Little Darwin
Some people are picky about wheel dish etc. Just to keep the rear wheel placement near ideal, I would add a washer on both sides in order to kep the wheel centered between the drop outs while creating the extra clearance on the drive side.
Frankly, I couldn't see that the wheel was off-centre by 0.5mm with the naked eye, but if it helps you sleep better, add 1 mm of washers on the left as well. That would make it slightly harder to get the wheel between the dropouts.