Transom glass and the garboard plug

[phatdaddy]

You could drill a 2 inch hole where the original drain hole is. Then pour a hockey puck out of epoxy the same thickness and diameter. After it cures, epoxy it into the hole u drilled and drill a new drain hole. Not sure of the accessibility, but u could also put a layer of glass on the inside to strengthen it.

Or dry out the hole with a heat gun, coat with some thinned epoxy ,rotate the garboard plug and put in some fresh screws. Call it a day and deal with it when u address the transom