Leak repair really isn't that hard. The gudgeons are secured to the rear of the hull through two bolts on each one. There will be two nuts and a piece of aluminum plate (used like a big washer) under each nut inside the hull. You will need to use a ratchet and reach through the access port on the stern to hold the nuts while you loosen the bolts with your other hand from the outside of the hull. It really is quite easy to do. The stainless steel brackets will probably fall right off the hull once you have removed the hardware. HOWEVER!!! Mark the position of the gudgeon on the hull with a pencil prior to loosening because one of them (I believe it's the lower one) is slotted to move side to side to allow alignment of the rudder vertically with the hull. If you mark it in place, it should be easy to put it back in the same position. Reinstallation is simply the reverse - put a bit of the sealant (5200 is not very removable in the future but 4200 is) around the bolts and the back of the gudgeon prior to reassembly. While still uncured, You can clean up and get a really nice finish on these 3M sealants using a rag soaked with mineral spirits. All these items can usually be found at Walmart (although I've had trouble finding Mineral Spirits there lately! - check the automotive section).

It's pretty rare that the gudgeons are the source of a significant hull leak. Also take a close look at the drainplug hardware too.