Originally Posted by mikesova
What kind of plug did you use? I would try a rubber wing nut plug (similar to a marine drain plug). You might also want to fill it up and plug both ends. I don't know if it will expand like you want with one end un-plugged.
I really had to wrench on it, but my overly complicated plug is now holding. There is a definitely a reduction in size of the dents as well. I just pulled it out of the freezer to start thawing it for the third time. I bet I have to do it ten times or so, but it is working.