By the time I came along, Gundecking could be an art form in the hands of a master like O'Toole. Most Gundecking is the simple checking off of boxes on reports for maintenance or inspection. More elaborate needs could require Quiji Boards, modified game spinners, and critically the Magic 8 Ball.
There was a tradition when I was in the Navy of the "Short-Timers Rope." The rope, or sometimes chain, had as many knots ( or links) as remained in the sailor's enlistment. At the end of each day, a knot, or link, was cut off. I saw this happen at meals.