Due to not recognizing the difference in hinge types, I had inadvertently installed a piano hinge with rolled knuckles (MS20257) rather than extruded knuckles (MS20001) as called for in the plans. Drilled out the rivets on the rudder hinge and began removing the skin under the tail in order to remove the AN3 bolts holding the Y and stiffener. Will remove the stiffener to access the hinge for removal, then reinstall.