In the teachings of Watchtower Corporation, Jesus' dead form was replaced by the term straight pillar instead of a cross. The reason is that the Greek word 'stauros' corresponding to the cross means a single pole without a cross. But this is a very hasty conclusion. Stauros includes a straight column, because it does not exclude other additions to the straight column. It can be inferred that the scripture itself is natural that the shape of Jesus' execution means that the straight pillar is the main pillar Y and the addition is placed horizontally on the X-axis.
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. Moreover, it is much more natural to say that the sign "King of the Jews" is on the head in Matthew 27:37 when both hands are nailed to a cross stick. Because if both hands were nailed to one pillar, it should be said that there was a sign above the hands, as shown in the picture below, not above the head.