Place the wheel on a truing stand or take an axle and clamp it in a vice so that the wheel will be horizontal (the axle is vertical) when placed on it. Go around the wheel with a spoke wrench and put a little tension on each spoke. Next, put the surface gauge in position and give the wheel a spin. The loose-laced wheel will wiggle in one of three ways: It will roll from side to side, it will have either a hump or dip, or once the other problems are addressed, the entire rim may sit either too high or low, relative to the hub. Since side-to-side motion (which is an up-and-down motion if the wheel is positioned horizontally on the axle) is the easiest to remedy, start by finding the center point of the twist. Spokes will pull the rim sideways when they are tightened so tighten the spokes that would pull in the opposite direction as the twist. For example, if the rim is high in one section (assuming it's on the stand horizontally), tighten the spokes on the bottom side of the rim. Do just the opposite for low sections. Only turn the nipples in the center of the high point one or two of the flat sides and nipples at the outside of the imperfection one or no flats, depending on the severity of the side-to-side roll. Several small adjustments may be necessary to fix the problem.