The Tiller Trimmer is a simple self-steering device for tiller-steered boats. Mount it on your tiller, run a control line from one side of the cockpit to the other through the Tiller Trimmer, and you can lock the tiller in place by tightening the unit’s control knob. The device, made of N6 Nylon, has a ball-bearing Delrin sheave that evenly feeds the control line into the control knob, regardless of angle. $60. J. Schofield Ltd, 011-44-1995-672556, www.tillertrimmer.com