After a little research I have installed the Cansail Tiller Lock http://www.cansail.com/for my Pocketship. Easy to install and worked great when raising/lowering sails and when you want the rudder locked to use a small outboard for propulsion.. It has no plastic parts that could break or wear out easily. It is made of only stainless steel and navy brass and only cost $39.95. I installed it with small padeyes and a brass snap on one side so that you can quickly detach the rope and make more room in the cockpit if necessary.