Another trick is to put plastic zip tie around the fork blade for the front wheel and one of the stays for the back wheel. Cut the zip tie, but leave enough to be close to the rim. If you cut it a little long you can rotate it a little to get it closer or farther from the wheel as the wheel trues. It gives you narrower focus point than a whole brake pad, which I find makes it easier to true. You also don't have to mess with the brakes at all, so readjusting them shouldn't be an issue.