[lukasz70]

you took the words right out of my mouth LR, except for the worse then alu part, thx for the info

my next thread was going to be a question on painting the inside of an alu block, i was just thinking of the TC-4? block, the metal top version is alu and its painted.
im thinking of just using some gloss rustolium spray paint on the inside, but will paint decrease performance?

yeah when i found out i can get that much alu i was pissed that i had my copper milled to that S shape design the first blocks had

oh, and i will be using distilled water, probably no additives,

one more thought, i do have some thin copper slabs about 5mm thick, i was thinking of using those as the base and solder a brass housing for it. the only thing is i will be limited to that switech design of drilling small pits in the copper which is not what i wanted to do,