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Do you have any sketches or pictures that I can see?
I apologize for that long delay.
I was locked out of the question for several days. It was frustrating to me because I could see you responding, but I was unable to post
4 mm holes in 4" square tubes will not have an appreciable impact on the tensile strength of the members
It does present a way for water to get inside the member and sit and corrode it