I cannot get the self bailing drain off of my 1971 sunfish to install the new plastic bailer. Anyone have tips? ...I have already tried penetrating oil. A friend of mine also hack sawed off the top flat metal inside the cockpit.
If you have a Dremel tool with a cut-off wheel, carefully cut off the aluminum hex nut so you can pry it apart with a screwdriver; it will break easily. Then just tap out the shaft from cockpit with a hammer. Clean up the hole and install the newe plastic bailer.