I like the shear pins.
Don't have a pic, but drill high up out of the water through the Al plates and rudder stock WITH THE RUDDER AS FAR DOWN AS POSSIBLE. You want the area out of the water and accessable from the cockpit. I didn't, but as you pointed out, one should then drill the rudder stock wider, fill with epoxy and then drill through with the origional bit. What size, I forgot, BUT, I use old papermate pens (the thin ones), gut them and then core with chopsticks. Wood alone chafes and swells, hollow plastic too weak and I go through too many at $5 for two. Works great and cheap!If you use the line and cleat, there is a way that will allow the line to release. In shallow waters, like where I sail, the danger would be from ripping out the rudder at the transom, not just damaging the rudder. With properly designed (even homemade) pins, they break and the rudder is fine. Hit a rock and you may have minor easily repairable damage. alan