My Courbet model has 16 pages of parts and diagragms! To track where all the parts are, I made a grid from some spare acetate sheets and divided it into 36 squares. I then numbered the required pages starting at A. I created data sheets in Excel and by overlaying the graph on the page, I noted down on the data sheets where each part appeared on the grid. If the part overlapped more than 1 square, I noted the square where the part No. appeared. This makes small parts easy to find.