Diane and Evan had the core for Ceilydh’s new rudder shaped by numerically controlled machining, at left. The process included cutting the rebates on the insides of the two halves, at right, which were a perfect fit for the the rudder stock and its webs, at top of page. Issue 105 : Nov/Dec 2015 With just a few days left until landfall on our 2,800-mile passage from Mexico to the Marquesas, we noticed the steering felt funny.