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Here's an article covering pad materials from the June 1977 Backpacker magazine: http://books.google.com/books?id=_98DAAAAMBAJ&pg=PA69.

It compares "Volarafoam", Minicell L-200, and Evazote, among...

Take a look at Pedro's pad eye post at http://www.hammockforums.net/forum/showthread.php?t=10084. Pics on page 2. Distributes load over two smaller diameter screws per attachment, so it's more secure...