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Mike, for what it's worth, I've had very little time so far for casting, but I have attempted several times to cast (ambiently) arch-bar sideframes. I'm very happy how my mold turned out, but None of the four castings have been without voids. After reading Richard's post I think this might be due in part to stirring too long, and therefore not enough time to fill the mold before gelling.
I do plan to invest in a vacuum setup ASA(financially)P.
This has been a very informative thread. Thanks for posting, all!
 
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