M_Boats: M15 expanded keel problem

In my search for an M15, I found a 1981 where the swing keel is rusted and expanded so that it won't lower. How difficult and expensive is this to fix? Should I run scared or consider this a good opportunity for an affordable boat? How does the swing keel come out? It seems that it pivots on a pin, but is the pin permanently glassed in and require cutting a lot of fiberglass to get it out? Thanks, Tyler Riverside, CA