I have just dug up a long discussion I had with “Wayfarer 5011” and Kjell Gjaere back in 2005 about the best position for the CB pivot pin hole in a new board. Unfortunately the link to the all-important drawing no longer works. Their e-mail addresses were then hotlane@hotmail.com and kjgj@online.no. You could try them or Swiebertje might be the man to ask about this.