So this is the plan. I have modified a small screw driver and sharpened it to make a micro chisel.
I then used it to chop out the small rectangular drain holes to a depth of abot half a mil. Its not so deep that it will upset the lay up, but it is deep enough to appear to be a square shaped hole. Once I drill a round hole in the middle of the eventual cast shell it will read as a square, not a round hole.
This still needs a bit of work but you get the idea.
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