The rudder, and various brass components - from lower left to right: mizzen halyard sheave, pin & locking cleat, eyebolt, bobstay cleat. At top centre, the stages in making the main halyard sheave. Note the 0.2mm diameter hole in the left-hand (highest) rudder pintle. This was for the split cotter-pin which prevented the rudder rising in the water. This pin (¼" / 6.4mm full-size diameter) did not have to be thicker, as the lifting pressure on the heavy vertical rudder was relatively small.