Davis Tiller Tamer 
Maintains cruising course with no hands, in any weather or wind condition. The tension is smoothly adjustable from fully locked to fully free. Tiller-Tamer gives improved control and feel to the tiller handle. Does not interfere with automatic steering systems. No loss of cockpit space. No need to lash the tiller when boat is moored or trailered.
Quick Guide (pdf)
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