"In John 20:25, the number of nails is not clear, but in all English Scriptures, including NW, there is a plural number of nails, so it is natural to think that the nails were done separately in both hands rather than gathering hands on pillars."
I think that it was a single pole with one hand placed on one side and a nail through it and the other hand placed on the other side with a nail through it, which is easier than one nail through both hands. Thus nails plural in his hands. That is easier than a cross beam as there has to be nails to go through that. They would want to conserve resources.