On flatness of copper plate
The leveling machine in a mechanical plant is either subjected to long-term compression,
You do not know the specific 2*2 is better, if the CM suggest that you go directly to buy a new coin, is sold in many hardware market, various specifications are, if you require better flatness, with shears, if it is 2 meters only slowly struck
Find an iron gate factory, especially the garage door and color steel door, they have a smooth machine, more than a few times to try! But 0.5 is too thin, I hope it's not very big! Even if you are successful, you can not achieve the mirror effect!
