I don't like how the lead boolits flat place made with a file so the hardness can be checked, it seems fuzzy, making it kind of hard to get a good reading. so I cut a square of alu thatI use to make gas checks with, I cut so it just fits inside the mold, I close the spru plate, make sure the edge is against the spru plate, close the mole, pour, 4 1/2 boolits, they a have nice smooth surface to test, it makes it easy or me to read the microscope. just thought I would toss this out there.