Why is there a hole in the large surf board (6075)? Why does the large surf board (part 6075) have a large hole in it? The hole is larger than a normal stud. An example of this part is found in red in Coast Guard Starter set (60163):



Here's a closeup of the board so that you can specifically see the large hole that I'm asking about:
This part is sometimes used to build a windsurfer as shown in Stephanie's Beach House:



The hole is larger than a stud because it is designed to receive a towball connection of some kind, usually a mast such as this one: