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Originally Posted by -J-
how thick should be the base of the block to support such a pressure?
because here i was told that thinner is better in this case, but how thin would be too much?
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Water side, yes, the thinner the better but with high wattage applications large copper-coolant surface are is required so thin but with lots of surface area.
Die side is a different ball game, the thicker the better. The reason in short is spherical shape of thermal energy dispersion pattern and large capacity (thermal inertia) created by thick cold plate between TEC and die.
-J- , I think your washer idea may work, it depends upon the strenght of material washers ae made off. If they are not strong nuff they will crawl out from under your bolts, use of steel washer inbetween may help there - going from bottom to the top block-plastic washer-steel washer-bolts head. Bolt musn't touch the block (hole must be larger than bolt's diameter) and your washers need to be quite thick *you may use more than one thin one)