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- Panama
Copper transfers heat almost twice as well as aluminum if you can get a copper plate. Brass isn't even close to aluminum.I just keep a piece of 1/4 aluminum plate in the freezer. It works fine, but does need refreezing if doing a lot of pressing. @Mañ'O'Green uses a cast iron gym weight for the same idea. You don't need machinery, just something that can be frozen and has some weight to it.