[Fixittt]

I have tried investment casting. Its a no go for me. One, I could not find someone local that pours pure or close to pure copper. It was always a huge ratio alloy. Second, after the casting was made, and I did my finish up machining to the base plate. at 5 mm thick I gor water leakes. It would seem that with this thin of a base plate the pours were connected and allowed water to seep out. Just my experiance. So I scrapped the idea.