These Dorman copper expansion plugs are quite a bit better and could be a more permanent fix. I've heard that some marine engine builders use these rather than press in plugs on new builds.
Thanks for posting that, old book I have mentions Mr. Gasket making those back in the day, apparently not any more, these Dormans appear to be the same thing. Dorman Products - 02483
Just ordered me a few:thumbsup:
