We bought a Sunfish last year and had it out many times without incident. This weekend, the rudder came off twice shortly after launching. I always make sure it is locked in well. I dont know how this happens as you need to push up on the pin which is spring loaded in order to unlock it. I managed to get it back on but what a pain. Ive heard this is not an uncommon problem. Can anything be done to insure it stays secure??