I noticed on mine that all the corrosion started where stainless (bolts, hinge pin) were in contact with the aluminum. The person I was talking to about refinishing them said it would be an ongoing issue because of the dissimilar metals. Mine has anodes and is grounded. He suggested trying fiber washers. Did they get the Durafortress in the bolt holes and hinge ?

Looks like a cases of Galvanic Corrosion.... I'd put a Magnesium anode on the babies, and make sure and bond them to all the other external components.

Anyplace where aluminum and stainless come in contact there needs to be a barrier of some kind between them. In the aerospace industry allot of times it is paint or hard anodize, if you don't do this now it will continue. just my $.02

Check out this galvanic info page from NASA (Corrosion Laboratory at Kennedy Space Center)...they even have a pic of a stainless screw in aluminum plate showing your damage after just six months. Good info here.

http://corrosion.ksc.nasa.gov/galcorr.htm

Our SS pins were also getting loose due to wear. About 5 years ago, we drilled out both the 380 plates and the transom mount plate with a long bit and inserted slim Delrin sleeves (or similar material) and we have have no additional wear.

I drilled and tapped it and added a zinc anode .. does this even look right? It only has a small contact area at the bottom, its an anode I picked up from a local Marina, thats all they had.