Often called the spring cleat, this piece of amidships hardware is generally located near the windshield, at your boat's center of turning. That means if you give a good tug to a line affixed to the spring cleat, the boat should move straight sideways. Even better, you can use your engine to do some of the pulling, and the boat will respond in the same way. Start by getting the line ashore, even if this means nosing in and then back out to get it there. Just make sure that first line ends up tied to your center cleat. Cleat one end of the line — dockside or aboard, depending on your crew scenario — and simply wrap the other end so that it can hold tension, but then be loosened to take up slack. Now, bump the throttle forward a bit, then back. Each time you "rock" the boat one way or the other, the cleated line will pull you a bit toward the dock. As this happens, unwrap the loose end of the line and rewrap it to take up the slack. You'll move steadily toward the dock with full control, and no chance of a dock-thumping swing of the bow or stern.