Dan C. is a retired business executive just looking for something akin to his hobby to do when it is too cold to be out taking photographs.

The lensboard on the camera is the board with the hole in the center where you mount the lens/shutter. This camera uses a 4x4 board and it is made in three pieces to minimize warpage.  Any slight warpage can result in light leak....a no no!   The end pieces of the board have grain orientation on the vertical direction while the certer piece has grain orientation at right angles to the ends.

 

Another method Dan has used is to make the board in two pieces 1/2 thichness and laminate them 90 degrees.

The back of the board would show the mounting hole and the counterbore for the mounting ring and a 1/4 inch route to block light when mounted to the front standard of the camera.