Years ago I was told that there was a change to the type of aluminum used to make hexes. The older type was softer, and so the walls were thicker; these hexes came drilled for lightness. The change to a harder material came with a reduction in wall thickness. I was told that these newer ones should not be drilled.
This is just something I was told, so it could be a myth. However, I have chosen not to drill my new (20 year old) hexes, just in case.
JamesMc |