I noticed that the rudder on my Sunfish felt loose and when I looked at the gudgeon, I found that the stainless steel bolts on the upper aspect of the fitting had corroded away and broken internally such that although I could see the screw heads on the outside they were no longer connected with the shaft of the bolts. There are four bolts altogether, and the two bolts on the lower part of the gudgeon are intact. What apparently happened is that the "stainless" bolts corroded away and broke off so that the remaining portion of the bolts within the hull is now flush with the transom. Does anyone have any tips or ideas as to how to remove the broken portion of the bolts within the hull? Any suggestions would be welcome since the rudder is obviously a key part of the boat and I don't want to screw it up.