Would I get the same kind of (galvanic?) corrosion with the brass and copper that happens between components when using aluminum and copper? If not then I will look into this. If it still will corrode maybe I can still get away with aluminum or brass for the top plate, as I dont' think it will really be in contact with the water that much. However the middle plate will, so....
EDIT: and although brass (as you say, i've never milled it before) and i know even aluminum would be easier to mill, most of the operations that need done to the middle and top block consist of drilling straight or tapered holes.
Only real milling to be done is on the middle plate :
o-ring, and take .040" off the underside except where the islands are.
none the less, easier is easier, so i will def. look into it. thanks for suggesting it.
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