Just a quick note... the concave nature of the copper blocks is a function of the manufacturing / operator. Infact, you can reduce this effect by slowing down your feeds and speeds and NOT clamping the block so hard. Cooper is soft and you WILL bend it if you crank down on the vice holding the block.
See I guess there is a choice made here. Slow down the feed and speed and use less clamping pressure (increase your cost). Or crank it up clamp it down and let the end user rub each block. Think about it this way... if DD had to rub each one of the blocks for 15min to get them flat, your just increased your price $10.
Just an observation...
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