Posted by LEE on April 12, 2006 at 23:44:39:
In Reply to: How to minimize core hardness? posted by Ron V on April 11, 2006 at 07:03:26:
mask with copper plate and paint the surface with a mask called no-carb,
or leave the holes under size prior to heat treat
then turn them to size after heat treat to remove any hard spots.
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