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Old January 24, 2011, 01:02 PM   #9
Join Date: March 4, 2005
Location: Ohio
Posts: 13,827
Vents on my iron molds (all 20 years old or more) were clearly put in by a horizontal mill, and are bigger than an Exacto knife scratch. They are where I got the 0.005" number from. The fly cutter marks in Lee and other aluminum mold are smaller than the grooves in the iron molds, but they are more numerous. I think that's why they work out.
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